Here's the list of useful Freeware Application for your Windows Operating System. List will be updated from time to time to make sure that every applications on the list are totally FREE.

Note: Please carefully look over each install dialogue because ptional items and/or toolbars are many times auto-selected in freeware applications, select 'custom' install and be sure to deselect anything you don't want to be sure that Optional items and/or toolbars are rejected when installing an Application.

Anti-Virus/Security:
Avast Free AV: an efficient and comprehensive antivirus program. It is one of the most popular antivirus programs available, thanks to the reliable and trustworthy brand that Avast have created.
AVG Free: trusted antivirus and antispyware protection for Windows available to download for free. In addition, the new included LinkScanner® Active Surf-Shield checks web pages for threats at the only time that matters.
Avira Free:  FREE Antivirus is a reliable free antivirus solution, that constantly and rapidly scans your computer for malicious programs such as viruses, Trojans, backdoor programs, hoaxes, worms, dialers etc. Monitors every action executed by the user or the operating system and reacts promptly when a malicious program is detected.
BitDefender Free: an on-demand virus scanner, which is best used in a system recovery or forensics role. 
ClamWin: a Free Antivirus program for Microsoft Windows 98/Me/2000/XP/2003 and Vista. ClamWin Free Antivirus comes with an easy installer and open source code. You may download and use it absolutely free of charge.
Comodo Firewall: Secure your system against internal attacks such as Trojan viruses / malicious software and external attacks by hackers.
Comodo Internet Security: Comodo claim that their firewall is unique in that it passes all known leak tests to ensure the integrity of data entering and exiting your system. Comodo has put firewall through all kinds of sophisticated tests to ensure its firewall powerful enough to ward off these attacks with default settings. No other firewall has had to work this hard.
CureIt!-Dr. Web: an antivirus and anti-spyware scanning tool that is developed on the Dr.WEB engine which will help you quickly scan and cure, if necessary, a computer without installation of the Dr.WEB Anti-virus. 
Microsoft Security Essentials:  provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
OutPostFree Security Suite: (multi-platform full-functional Free Internet Security Suite) Anti-virus, firewall, anti-spam, and more for all-round proactive protection that's totally free. All-in-one online and offline malware defense and powerful data leak prevention combine to deliver robust, bullet-proof security for individuals and families.
Rising Antivirus Free Edition: Free antivirus protects your computer from viruses, trojans and other malicious programs.
SpywareBlaster: protects you from known unwanted websites including Active-x installs, hijackers, cookies and more.
Sandboxie: Sandboxie runs your programs in an isolated space which prevents them from making permanent changes to other programs and data in your computer.
MailWasher: Password must be a minimum of 8 characters containing 1 uppercase, 1 numeric, and 1 special character.
Spamfence: offers complete virus protection. Spamfence's virus protection identifies viruses via three complementary methods of virus fingerprinting, outbreak detection and virus signature scanning. Spamfence users benefit by sensing virus outbreaks within the first few moments of an attack, hours before conventional virus scanners can react.
Spamihilator: Works between your email client and the Internet and examines every incoming message. Useless and unsolicited spam mails (junk) will be filtered out. This process runs completely in the background. Spamihilator uses a number of different filters in order to achieve the highest spam recognition rate possible.
Metascan Online:a free online file scanning service powered by OPSWAT’s Metascan technology, a multiple engine malware scanning solution.
Panda USB Vaccine:a free solution designed to protect against this threat. It offers a double layer of preventive protection, allowing users to disable the AutoRun feature on computers as well as on USB drives and other device.
Ad-Aware: a real-time protection, download protection and continuously updated filters against malicious URLs, providing top-of-the-line anti-malware protection for the casual computer user.
Combofix: a program, created by sUBs, that scans your computer for known malware, and when found, attempts to clean these infections automatically. In addition to being able to remove a large amount of the most common and current malware, ComboFix also displays a report that can be used by trained helpers to remove malware that is not automatically removed by the program.
Dr.Web CureIt!:quickly scan your computer and cure it of any malicious objects.
Emsisoft Emergency Kit: contains a collection of programs that can be used without installation to scan for malware and clean infected computers. 
GMER: an application that detects and removes rootkits .
HijackThis: A utility that detects malware and other threats.
Malwarebytes:Employs malware removal techniques so innovative that computer technicians often recommend Malwarebytes when an antivirus can't finish the job.
NoraScan; A utility that scan and detects malware and other threats.
OSSEC: a scalable, multi-platform, open source Host-based Intrusion Detection System (HIDS). It has a powerful correlation and analysis engine, integrating log analysis, file integrity checking, Windows registry monitoring, centralized policy enforcement, rootkit detection, real-time alerting and active response.
RKill: just kills 32-bit and 64-bit malware processes and scans the registry for entries that would not allow you to run various legitimate programs.
Sophos Anti-Rootkit: scans, detects and removes any rootkit that is hidden on your computer using advanced rootkit detection technology.
Spybot Search and Destroy: The all-in-one antispyware and antivirus software solution
SUPERAntiSpyware: Detect and Remove Spyware, Adware and Remove Malware, Trojans, Dialers, Worms, KeyLoggers, HiJackers, Parasites, Rootkits, Rogue Security Products and many other types of threats.
TDSSKiller: a program or a program kit that hides the presence of malware in the system.
Trend Micro HouseCall:can quickly identify and fix a wide range of threats
including viruses, worms, Trojans, and spyware.
Vba32 AntiRootkit: designed to analyze the computer for the anomalies that arise due to the presence of malware in the system.

Audio/Music/Media:
ASIO4ALL: Universal ASIO Driver For WDM Audio.
Audacity: an open source, cross-platform software for recording and editing sounds.
EAC-Exact Audio Copy: an audio grabber for audio CDs using standard CD and DVD-ROM drives.
Foobar2000: an advanced freeware audio player for the Windows platform.
Free Music Converter: allows you to transcode any audio formats, including MP3, AAC, WAV, MPA, RA, CDA, FLAC, M4A, MID, MKA, WV, TTA, AC3, WMA, MPC, APE, OFR, OGG, MP2, DTS.
Power Sound Editor Free : a visual audio editing and recording software solution, which supports many advanced and powerful operations with audio data.
Songr:  a cloud music player that streams and downloads music from multiple web services, including Grooveshark, Prostopleer, MusicSearch, YouTube and many others (including the music already on your computer).
StreamWrite: a free application for windows that records music broadcasted by internet-radiostations.
MusicBrainz Picard: mp3 tagger.
MP3TAG:a powerful and yet easy-to-use tool to edit metadata of common audio formats where it supports ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE Tags.
Rename Master: a freeware utility designed to rename multiple files with that has worked with websites, file archives, or collections of music, videos, or pictures in just few clicks.
TagScanner: a multifunction program for organizing and managing your music collection.
AIMP: a free audio player with support for large number of formats and playlists.
GOM Player: a completely FREE video player,with its built-in support for all the most popular video and audioformats, tons of advanced features, extreme customizability, and the Codec Finder service.
iTunes: a media player, media library, and mobile device management application developed by Apple Inc. It is used to play, download, and organize digital audio and video
MediaMonkey: a media management suite with tons of features in it.
Media Player Classic: a light-weight, open source media player. It supports all common video and audio file formats available for playback.

MusicBee: use to find and play music files on your computer, on portable devices and on the web.
QuickTime: a  media player from Apple allows the playback of quicktime movies (.mov) and many other formats.
UMPlayer: a media player that fills all your needs. With dozens of advanced features and built-in codecs it can handle any media format, and can play Audio CDs, DVDs, (S)VCDs, TV / Radio cards, YouTube™ and SHOUTcast™ streams and even incomplete or damaged media files.
VLC Player: a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.
WINAMP: a skinnable, multi-format media player. Winamp supports a wide variety of contemporary and specialized music file formats.
MediaPortal: allows you to watch, listen, read and play your media as you want to, without getting in the way, or having to learn difficult navigations systems.
XBMC: allows users to play and view most videos, music, podcasts, and other digital media files from local and network storage media and the internet.
K-Lite Codec pack: contains everything you need to play all popular audio and video file formats.
Shark007: advanced codecs for Windows 7 and 8.

Internet Browsers:
Avant Browser: an ultra-fast web browser. Its user-friendly interface brings a new level of clarity and efficiency to your browsing experience, and frequent upgrades have steadily improved its reliability.
Comodo Dragon: Fast and versatile Internet Browser based on Chromium, with highest level of security.
Mozilla Firefox: (known simply as Firefox) is a free and open-source web browser.
Google Chrome: a browser that combines a minimal design with sophisticated technology to make the web faster, safer, and easier.
Kylo:Open-source browser for your TV.
Maxthon Browser: a simple and fast web browser for your PC.
Opera: free, and it is the smallest and fastest browser in the world.
Safari: a web browser developed by Apple Inc. and included with the OS X and iOS operating systems, also available for Windows.
SlimBrowser: a tabbed multiple-site web browser from FlashPeak that uses the Microsoft Trident layout engine.
SRWare Iron:based on the free Sourcecode "Chromium" - without any problems at privacy and security.

CD/DVD Burning & Tools:
bitRipper: FREE DVD to AVI software that allows you to back-up your DVD's as AVI files on the hard drive.
CDBurnerXP: a free application to burn CDs and DVDs, including Blu-Ray and HD-DVDs.
DeepBurner: the advanced and powerful CD and DVD burning package. It removes the hassle of making autoruns, creating and printing your own labels and booklets.
DVDShrink: A FREE software solution for shrinking original DVDs onto recordable media
Free ISO Burner: Free ISO Burner can directly burn your ISO and CD/DVD image file to CD-R,CD-RW, DVD-R, DVD-RW, DVD+R, DVD+RW,HD DVD and Blu-ray Disc, no need mount any "virtual drives" which emulate physical CDs or DVDs, it write any data directly. 
ImgBurn: ImgBurn is a lightweight CD / DVD / HD DVD / Blu-ray burning application that everyone should have in their toolkit.
Infra Recorder: a free CD/DVD burning solution for Microsoft Windows. It offers a wide range of powerful features; all through an easy to use application interface and Windows Explorer integration.
Nero MediaHome: free media manager for your photos, music and videos. The complete, all-in-one source lets you find, organize, edit, play, share, sync, burn and enjoy your media with the built-in market that lets you buy and activate the apps you want for a truly unique experience.

CPU, Hardware & Memory Testing Tools:
CoreTemp: a compact, no fuss, small footprint, yet powerful program to monitor processor temperature and other vital information. 
CPUZ: allows you to review all kinds of detailed data about various areas of your computer in a straightforward and concise manner.
Disk Benchmark: Test Hard Drives, SSD Drives, HBAs, RAID Adapters & Storage Controllers
GPU-Z: a lightweight system utility designed to provide vital information about your video card and graphics processor. 
HWiNFO/32/64 Tools: Comprehensive Hardware Analysis, Monitoring and Reporting for Windows and DOS.
HWMonitor:  a hardware monitoring program that reads PC systems main health sensors.
IntelBurn Test: A program that simplifies the usage of Intel(R) Linpack.
Memtest86:  the orginal self booting memory testing software for x86 computers. Supporting both BIOS and UEFI, with options to boot from USB and CD.
OCCT:  a stability checking tool that was created back in 2003, and was regularly updated since.
Prime95:has a feature called "Torture Test" that allows maximum stress testing on the CPU and RAM.
RealTemp: a temperature monitoring program designed for all Intel single Core, Dual Core, Quad Core and Core i7 processors.
SIW: an advanced System Information for Windows tool that analyzes your computer and gathers detailed information about system properties and settings and displays it in an extremely comprehensible manner.

Data & File Recovery:
Recuva: a freeware Windows utility to restore files that have been accidentally deleted from your computer.
Mini-Tool: Data Recovery Boot Disk for user to facilitate data recovery when operating system is damaged.

EASEUS: a hard disk partition software. You can create, delete, format, resize/move partitions on your hard disk quickly and easily.
PC Inspector: a data recovery program that supports the FAT 12/16/32 and NTFS file systems. 
TestDisc: a free and open source data recovery utility. It is primarily designed to help recover lost data storage partitions.
PhotoRec:  a  file data recovery software designed to recover lost files including video, documents and archives from hard disks, CD-ROMs, and lost pictures (thus the Photo Recovery name) from digital camera memory.

Extraction and Compression:
7-Zip: a file archiver with a high compression ratio. 
ExtractNow: a simple utility that allows you to extract multiple archives quickly and easily.
HaoZip: an archive program which supports RAR and ZIP files.
IZArc: free file compression utility supporting many archive formats.
PeaZip: Free Zip files utility, free Rar files extractor.
Universal Extractor: a program designed to decompress and extract files from any type of archive or installer, such as ZIP or RAR files, self-extracting EXE files, application installers, etc.
Winrar: a Windows data compression tool that focuses on the RAR and ZIP data compression formats for all Windows users.

ZipGenius: handles more than 20 types of compression formats and it allows you to browse CD/DVD-ROM ISO image files as if they were common archives.

File transfer & sharing/FTP Clients:
eMule: one of the biggest and most reliable peer-to-peer file sharing clients around the world.
EagleGet Download Accelerator: Best IDM alternative.
Free Download Manager: a powerful, easy-to-use and absolutely free download accelerator and manager.
FrostWire:  a free and easy to use BitTorrent+Cloud downloader app.

JDownloader: open-source download management tool with a huge community of developers that makes downloading as easy and fast as it should be.
Live SkyDrive:  a free online file storage system from Microsoft.
Mipony-download manager: a free download manager specially designed to optimize and automate the downloads.
PeerBlock: lets you control who your computer "talks to" on the Internet.
Shareaza;a peer-to-peer client for Windows that allows you to download any file-type found on several popular P2P networks.
Tixati:Free, Simple and Easy to Use Bittorrent Client.
uTorrent: Elegant, efficient torrent downloading.
Vuze: an end-to-end software application for all your torrent needs.
FileZilla: a cross-platform FTP application software, consisting of FileZilla Client and FileZilla Server.
PuTTY; an SSH and telnet client
WinSCP: an open source free SFTP client and FTP client for Windows.

Hash Tools
Febooti fileTweak Hash & CRC; http://www.febooti.com/products/file.../hash-and-crc/
HashMyFiles: Calculate MD5/SHA1/CRC32 hashes of your files.
Marxio File Checksum Verifier: allows you to determine the MD5 checksum value of a file.
MD5summer:Open source application which generates and verifies md5 checksums.
Microsoft File Checksum Integrity Verifier: an unsupported command line utility that computes MD5 or SHA1 cryptographic hashes for files.
WinMD5Free: a tiny and fast utility to compute MD5 hash value for files.

Home & Office:
CSVed: an easy and powerful CSV file editor, you can manipulate any CSV file, separated with any separator.
Everything Search:Locate files and folders by name instantly.
FileLocator Lite:  File Searching Utility.
FreeOCR: a free Optical Character Recognition Software for Windows and supports scanning from most Twain scanners and can also open most scanned PDF's and multi page Tiff images as well as popular image file formats. 
JR Directory Printer:allows you to print a listing of every file contained within a directory and/or subdirectory(ies).
Microsoft Mathematics: a freely downloadable educational program, designed for Microsoft Windows, that allows users to solve math and science problems.
Q10: a simple but powerful text editor designed and built with writers in mind.

QTranslate: a free translator for Windows (Windows 8/7/Vista/XP).
SimpleOCR: a freeware OCR software with hundreds of thousands of users worldwide. 
Speckie-Spell check: first and only dedicated, real-time spell check solution for Internet Explorer.
Stickies: a PC utility I wrote to try to cut down on the number of yellow notes I was leaving stuck to my monitor. It is a computerised version of those notes.
Wunderlist: beautiful and simple to-do list app.
IBM® Lotus® Symphony: a suite of open source office applications. It provides the common functionality you need to create, edit and share documents, spreadsheets and presentations.
LibreOffice:  a powerful office suite; Its clean interface and its powerful tools let you unleash your creativity and grow your productivity.
OpenOffice.org: an open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more.
Bullzip PDF Printer: works as a Microsoft Windows printer and allows you to write PDF documents from virtually any Microsoft Windows application. 
CutePDF: a Free PDF Converter.
doPDF: a free PDF creator that does what the name suggests, creates PDF files.
Foxit PDF reader: PDF Reader.
Nitro PDF Reader: Create PDF files from any source easily. Sign them securely. Then collaborate with anyone, anywhere.
PDFill PDF Editor: can use to merge, split, reorder, delete, encrypt, decrypt, rotate, crop and reformat PDF pages, add information/header/footer/watermark, convert image to PDF or PDF to image,  scan a Paper to PDF, and more.
PDF Creator: a FREE PDF Converter Tool.
Sumatra PDF: A free PDF, XPS, DjVu, CHM, CBZ, CBR reader for Windows.

Image & Photo Editing
Artweaver: a freeware raster graphics editor for Window.
FastStone Image Viewer: a fast, stable, user-friendly image browser, converter and editor.
GIMP: is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring.
IrfanView: a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer
Inkscape: a professional vector graphics editor.
Light Image Resizer: free image resizer and image converter software.
Paint.NET: free image and photo editing software for PCs that run Windows.
PaintStar:a versatile digital image processing software suitable for such tasks as retouching of photographs, composing and authoring images, image morphing, screen capture, and displaying image thumbnail in Windows Explorer context menu.
Photoscape: a fun and easy photo editing software that enables you to fix and enhance photos.
PhotoWipe:  a revolutionary image processing tool that magically removes unwanted objects from your photos.
Picasa: Google's Photo organizer.
XnView: software for reading, viewing, and processing all your images.
Zoner Photo Studio: photo editor and organizer.
GIF Viewer: a lightwheight and very speedy media viewer for Windows! It supports the most common image formats, and also video and audio formats.
PicPick: full-featured screen capture tool, Intuitive image editor, color picker, color palette, pixel-ruler, protractor, crosshair, whiteboard and more.
PowerBullet Presenter: a small, simple program for creating presentations in the Flash format. 

ISO Tools
Daemon Tools: An advanced application for Microsoft Windows which provides one of the best optical media emulator that enables you to convert your physical CD/DVD discs into "virtual discs" so called "images".
ei.cfg removal tool: a simple tool that will remove the ei.cfg file from any Windows ISO disc image, thereby converting the image into a "universal disc" that will prompt the user to select an edition during setup.
ImDisk (virtual disk driver): a virtual disk driver for Windows.
MagicDisc: a helpful utility designed for creating and managing virtual CD drives and CD/DVD discs. 
TotalMounter:allows user to mount virtual CD/DVD burner that is allowing to directly burn data onto an ISO file, not to an optical disk (such as CD or DVD).
Virtual CloneDrive: works and behaves just like a physical CD/DVD drive, however it exists only virtually.
WinCDEmu: works and behaves just like a physical CD/DVD drive, however it exists only virtually.
Windows 7 USB/DVD Tool: allows you to create a copy of your Windows 7 ISO file on a USB flash drive or a DVD. 
Magic ISO/Power ISO: a powerful CD/DVD image file creating/editing/extracting tool.
Ultra ISO:  image utility makes it easy to create, organize, view, edit, and convert your CD/DVD image files fast and reliable.

Privacy/Security Tools/Encryption:
Security Kiss Tunnel;
Tor Browser: protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, it prevents the sites you visit from learning your physical location, and it lets you access sites which are blocked.

HTTPS Everywhere: a Firefox, Chrome, and Opera extension that encrypts your communications with many major websites, making your browsing more secure. 
AxCrypt: open source file encryption software for Windows.
dsCrypt: is AES/Rijndael file encryption software with simple, multi-file, drag-and-drop operations.
Pismo File Mount: a Windows application that allows users to mount the contents of ZIP, ISO, Compact ISO, Compact File Set and Private Folder files to the file system as virtual folders.

Search Engines
DuckDuckGo: The search engine that doesn't track you.
Ixquick: The search engine that does not record your IP address.
Startpage: third-party certified search engines in the world that do not record your IP address or track your searches.

Programming:
AutoIt: a freeware BASIC-like scripting language designed for automating the Windows GUI and general scripting.
Codecademy: Learn to code interactively, for free.
ConTEXT: a small, fast and powerful freeware text editor, developed to serve as a secondary tool for software developers.
Crimson Editor: a professional source code editor for Windows.
DAMN NFO Viewer: a tiny application that can lend you a hand when trying to open documents in formats like NFO, DIZ or TXT files.
GetDiz: a Notepad replacement that offers a wide range of features while maintaining incredible speed, ease of use, stability, and small size.
jGRASP: a lightweight development environment, created specifically to provide automatic generation of software visualizations to improve the comprehensibility of software.
Notepad++: a free source code editor and Notepad replacement that supports several languages.
Programmer's Notepad: source code editor and Notepad replacement
SharpDevelop:  a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform. It is open-source, and you can download both sourcecode and executables from this site.
Win32Pad: an open source free SFTP client, FTP client, WebDAV client and SCP client for Windows.