Open Source Windows

Mozilla Firefox:
I think all ppls know about this? The premier free, open-source browser. Tabs, pop-up blocking, themes, and extensions. Considered by many to be the world's best browser.
Firefox web browser | Faster, more secure, & customizable

Mozilla Thunderbird:
Powerful spam filtering, solid interface, and all the features you need.
Thunderbird - Reclaim your inbox

Pidgin:
Connect to multiple IM accounts simultaneously in a single app, including: AOL, MSN,Jabber,Yahoo,G-Talk,Myspace IM,ICQ and so many.
Home | Pidgin

SeaMonkey:
Web-browser, advanced e-mail and newsgroup client, IRC chat client, and HTML editing made simple -- all your Internet needs in one application.


OpenOffice.org:
Big, full featured suite of tools for word processing and spreadsheets. Compatible with and a free replacement for Microsoft Word documents. Also supports OpenDocument Format.
OpenOffice.org: Home



Stellarium:

Nasa World Wind:
Mapping tool similar to Google Earth for Windows. Must have the .NET Framework installed.
NASA World Wind


GIMP:
Photo editing application for professional and advanced user,that rivals Photoshop in features.
GIMP - Windows installers

Paint.NET:
Graphics editor with a very nice interface.
Redirecting ...


VLC:
Plays more video files than most players: Quicktime, AVI, DIVX, OGG, and more.
VLC media player - Overview

Media Player Classic:
Powerful media player. Plays anything under the sun. No install necessary.
SourceForge.net: Files

Media Coder:

Ripping CDs, DVDs, etc and converting between tons of video formats.
MediaCoder - Downloads

Inkscape:
Vector graphics application.
Inkscape. Draw Freely.

Filezilla:
Excellent FTP program.
SourceForge.net: Files

NMap:
Easy to use port scanner for Windows.
Download the Free Nmap Security Scanner for Linux/MAC/UNIX or Windows

Wireshark:
Network Protocol Analyzer, formerly called Ethereal.
Wireshark: Download

TrueCrypt:
Creates encrypted virtual hard drives for extra security.
TrueCrypt - Free Open-Source On-The-Fly Disk Encryption Software for Windows Vista/XP/2000 and Linux - Downloads

Virtual Box:
VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL).
Downloads - VirtualBox

ClamWin:
Open Source Anti-Virus. Very good at detecting viruses. Can be plugged into hMailServer for e-mail protection LIMITATION: Real Time scanning not implemented yet.
Free Antivirus for Windows - Open source GPL virus scanner

7-Zip:
File archiver.
Download

SharpDevelop:
Open Source IDE for the .NET Framework. Utilizes the multiple programming languages and Windows forms.
Downloads ic#code

http://sourceforge.net/

SourceForge.net is the world's largest Open Source software development web site. SourceForge.net provides free hosting to Open Source software development projects with a centralized resource for managing projects, issues, communications, and code.
SourceForge.net

Yahoo Pops:
Yahoo! Mail disabled free access to its POP3 service o*n 24th April, 2002. This application emulates a POP3 server and enables popular e-mail clients like Outlook, Netscape, Eudora, Mozilla, etc., to download e-mail from Yahoo! accounts.

This does not go against the license agreements of Yahoo! Mail. This application is completely legitimate and well within the realms of legal software.

How to configure Yahoo Pops to work with your favourite e-mail software.
Download Yahoo Pops

Miranda IM:
Miranda Instant Messenger is lightweight. Miranda runs from a USB memory stick or a floppy disk. Miranda's features can be extended with plug-ins eg. Weather Protocol.
Download Miranda IM

DC Plus Plus:
The DC Plus Plus client is completely free of advertisements and is easy-to-use. Firewall and router support is integrated and it’s easy and convenient to use functionality like multi-hub connections, auto connections and resuming of downloads.
Download DC Plus Plus

Audacity:
Audacity is a free audio editor. You can record sounds, play sounds, import and export WAV, AIFF, and MP3 files, and more. Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. It also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications. Built-in effects include Bass Boost, Wahwah, and noise removal, and it also supports VST plug-in effects.
Download : Audacity


Image Magick:
ImageMagickTM 5.5.7 is a robust collection of tools and libraries offered under a usage license to read, write, and manipulate an image in many image formats (over 87 major formats) including popular formats like TIFF, JPEG, PNG, PDF, PhotoCD, and GIF. With ImageMagick you can create images dynamically, making it suitable for Web applications. You can also resize, rotate, sharpen, color reduce, or add special effects to an image and save your completed work in the same or differing image format. Image processing operations are available from the command line, as well as through C, C++, Perl, or Java programming interfaces.
Image Magick

Open Disc 7.10:
OpenDisc is a collection of high quality open source software for the Microsoft Windows platform, aimed at users exclusively using said operating system. The two goals of the disc are to provide free alternatives to otherwise costly equivalents, and to educate people about the Linux operating system. The disc will be updated periodically as new versions of software are continually released, and users are encouraged to volunteer in a number of ways, including suggesting new software to add to future versions to translating the text into different languages.
Download Open Disc

Mozilla Sunbird:
Mozilla Sunbird is a free, open source, cross-platform, personal calendar application developed by the Mozilla Foundation and many volunteers. Sunbird is licensed under a MPL/GPL/LGPL triple license, allowing use of the files under the terms of any one of the Mozilla Public License, the GNU General Public License, or the GNU Lesser General Public License.
Download


PDFCreator :
PDF Creator is an application for converting documents into Portable Document Format (PDF) format on Microsoft Windows operating system. Once installed, it allows the user to select PDFCreator as their printer, allowing almost any application to print to PDF.
Download


PDFEdit:
PDF Edit is a free and open source editor for manipulating PDF documents. You can change raw pdf objects (for advanced users) or use many gui functions. Functionality can be easily extended using a scripting language.
Download


RSSOwl:
RSSOwl is a RSS, RDF and Atom Newsreader written in Java. RSSOwl is such an application. RSSOwl lets you gather, organize, update, and store information from any compliant source in a convenient, easy to use interface, save selected information in various formats for offline viewing and sharing, and much more.
Download

PDF creator n edit...age themei freely use kortam....realy good. Rssowl shommondhe ajke janllam. thanks bhaia

FlasKMPEG

FlasKMPEG is a free easy to use video conversion software utility.

Mp3 Tag Tools

Intuitive ID3v1.1 & ID3v2.x, lyrics, picture mp3 tag editing utility.

SnackAmp Tcl/Tk Music Player

SnackAmp is a music player that works well in a networked environment where thousands of music files may used. You simply organize the files by your own scheme within folders and have SnackAmp play them. You can also catalog removable media such as CDs with music files stored on them and mount them via SnackAmp.

Solfege

GNU Solfege is a computer program written to help you practice ear training. It can be useful when practicing simple musical exercises.

Vidomi

Vidomi is a combination software application which makes and plays TV quality XviD and DivX™ MPEG4 video from your existing source files.

Virtual Dub

Have you ever worked with desktop video?Sure, you've probably played a few video clips on your monitor. But have you ever made one yourself? Used a video capture device? Wrestled with the software that comes with it? Felt like the software is a few leagues above or below your level? Time to try something else.

X-Tractor

X-Tractor allows to rip and encode music CDs into WAV, OGG and MP3 files.

xine - multimedia player

xine is a free multimedia player.

CDex

CDex is a utility for extracting (ripping) any audio files from an audio CD.

Oggdrop

OggDrop creates OGG files just by dragg'n'drop ! OGG is the successor of MP3 format.