pyBzEdit is a wxPython program designed to edit the world files used by the bzflag game. You will need Python, wxPython, and pyOpenGL to run it. There were also (now unmaintained), versions that run under IronPython/OpenTK or Jython/JOGL!
Box-A-Lot! is an open-source fighting game. It's aimed to run on any operating system, hopefully with cross-platform networking, between all OS'.
Slices images of a grid with markers in the corners into component images for each cell.
A sick and addictive arcade game. You control a hand holding some very heavy ball on a rope (physics simulation included), and there are a lot of enemies trying to eat your hand. You won't let them! Crush'em all with the ball!
A fast-paced arcade multiplayer game, which relies on using the physics - against your enemy, or... against yourself!
Sentence Translator for Windows and PHP, and eventually C. Specialises in constructed (artificial) languages, but also has support for natural languages.
The SquadX Turn-Based Engine is a game engine for aiding the development of tactical turn-based combat simulations (like the XCOM(tm) series). The project is being developed in C++, using OpenGL, GLUT, and SDL. It will have versions in Linux and Windows.
Text preprocessor that provides script based in-code code generation. It can be used to provide templates for languages that doesn't support them (C, Pascal). Of course, it is stronger than templates in C++ so you can find it useful with other languages
WUU was a program to keep your World of Warcraft UI addons updated with the most popular mod sites. It is no longer updated, and the domain used in the source code for updates is no longer owned by the maintainers. As such, the released files were deleted - but the source is still here, in case there's something to learn from it. There's no way to delete a project on SourceForge (http://webapps.stackexchange.com/questions/42490/can-you-delete-a-project-on-sourceforge), so...
ebookutils is a collection of utilities which are useful for working with ebooks, specifically the REB1100/1150/1200 models made by RCA/Gemstar in the early 2000s.
Pure Python implementation of GOLD Parser Engine. GOLD Parser Engine is a LALR(1) parser with DFA tokenizer. It uses compiled grammar table generated by GOLD Parser Builder (not included - available on http://www.devincook.com/goldparser)