Desktop Applications
- Blender Does everything related to 3D imaging. Steep learning curve but pleasant to use after practice
- Lyx A scientifically focussed word processor with a What You See Is What You Mean interface
- Amarok Music manager focussed on fetching interesting meta data such as guitar tabs, tour schedules, etcetera
- Yakuake A terminal emulator that appears and disappears at the press of a button
- Vimperator Technically this is a Firefox plugin but it completely changes the UI to behave like Vim
- Vim / GVim The powerful mouse-free interface of the vi text editor plus support for plugins, macros, a graphical interface (GVim), multiple buffers, syntax highlighting and more
Windows specific
- 7 Zip, The most comprehensive and least annoying archiving program I have found for Windows. Not actually Windows specific but not as needed on other platforms
- VLC Easiest way to play DVDs on Windows. Like 7-Zip this is mostly needed on Windows.
- Notepad++ A light weight programmers editor for Windows. I prefer GVim but this is still pretty good
- MinGW Minimal GNU for Windows. Provides common GNU commands like Bash, GCC, etcetera
- Putty An SSH client for Windows. Another thing to make Windows bearable
Command line
- RVM Used for managing multiple versions of ruby. Hit and miss but still worth while
- PonySay Command output is so much better when a pony gives it to you
Pre made web sites
- WordPress Used in the creation of this site
- Owncloud Own your own cloud service
- Diaspora Like Twitter without the character limit and evil corporation
Games
- 0 A.D. An open source RTS. This genre isn’t my thing but it’s widely regarded as very good
- The battle for Wesnoth Turn based strategy with emphasis on story. Has a very strong modding community
- Dead Cyborg Post-Apocalyptic sci-fi adventure game
- Armeagetron Inspired by the Light Cycle scene from Tron. Enough Said.