The Open Key

The Open Disc is a downloadble ISO of open source software. Below is a list of links to portable versions.

Design

Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License. It can be used to model, shade, animate, render and composite and create interactive 3d models.
Dia is a full-featured diagramming program that is roughly inspired by the commercial Windows program Visio. It can be used to draw many different kinds of diagrams.
GNU Image Manipulation Program is a freely distributed program for such tasks as photo retouching, image composition and image authoring. It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.
Inkscape is a vector graphics editor, with capabilities similar to Adobe Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.
Nvu is an easy-to-use web editor similar to Microsoft Frontpage or Dreamweaver. It is based on the same Gecko engine that powers Firefox and Thunderbird and features an FTP site manager, color picker, tabbed interface, CSS editing, standard-compliant markup, fully customizable interface, a built-in spellchecker and more.
Scribus - Desktop publishing tool
Tuxpaint – Kids paint program that is lots of fun

Games

Batlle for Wesnoth is a turn-based strategy game with a fantasy theme. Build up a great army, gradually turning raw recruits into hardened veterans. In later games, recall your toughest warriors and form a deadly host against whom none can stand! (Download the windows.exe file half way down).
Enigma - Puzzle Game (Downlod the minimu zip file).
Neverball – Tilt the floor to roll a ball through an obstacle course before time runs out.
Sokoban YASC

Internet

Azureus
Filezilla is a fast and reliable FTP client with lots of handy features. It supports resume on both downloads and uploads, timeout detection, firewall support, SOCKS4/5 and HTTP1.1 support, SSL, SFTP and more, all with an intuitive drag and drop interface.
Mozilla Firefox is a fast, full-featured web browser that’s easy to use.
Pidgin Portable is a multi-protocol instant messaging client that works with AOL Instant Messenger, ICQ, MSN Messenger, Yahoo! and more. You can log into multiple networks all with the same program. All your IM settings and buddy lists are self-contained, so it leaves no personal information behind on the machine you run it on.
HTTrack
RSSOwl is an opensource RSS feed reader.
SeaMonkey
Mozilla Thunderbird is the safe, fast email client that’s easy to use. It has lots of great features including quick message search, customizable views, support for IMAP/POP, RSS support and more. Plus, the portable version leaves no personal information behind on the machine you run it on, so you can take your email and adress book with you wherever you go.
TightVNC
WinSCP

Multimedia

Audacity Portable is an easy-to-use audio editor and recorder.
Celestia
Really Slick Screensavers
Stellarium shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. – Download the installer and extract to a folder of your choice. Copy the file “data\default_config.ini” to the application folder and rename it to “config.ini” (thanks to Lupo73 for the hint). Launchstellarium.exe
Sumatra PDF is a slim, free, open-source PDF viewer for Windows. Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features. It’s small and starts up very fast.
VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, XviD, WMV, mp3, ogg, …) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

Productivity

GnuCash
MoinMoin Desktop Edition
Notepad2 is a fast and light-weight Notepad-like text editor with syntax highlighting.
OpenOffice Portable is a full-featured office suite that’s compatible with Microsoft Office, Word Perfect, Lotus and other office applications. It’s easy-to-use and feature-rich, performing nearly all of the functions you’d expect in an office suite, but at no cost.
PDF Creator

Utilities

7-Zip is a file archiver (compression) utility for Windows with a great array of features
Abakt
ClamWin is a Free Antivirus for Microsoft Windows. It provides a graphical user interface to the Clam AntiVirus engine.
GIMP Tool Kit (GTK+)
HealthMonitor
TrueCrypt
Workrave

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