Teeworlds is a multiplayer online shooter with a distinct 2D/retro look. It's available cross-plattform. Apart from Capture The Flag or Team Deathmatch provides other and custom modes as well as maps.
Automatic Drawing Generation is a GObject-based library that provides a non-interactive Cairo canvas specifically designed for generating technical drawings. It is intended to be used by software developers to integrate mass customization applications or to supersede parametric CAD workflows.
FidoCadJ is a very easy-to-use editor, with a large library of electrical symbols and footprints (through hole and SMD). Drawings can be exported in several graphic formats (PDF, EPS, PGF for LaTeX, SVG, PNG, and JPEG). Although very simple and not relying on any netlist concept, FidoCadJ uses a file format containing only UTF-8 text, very compact and suited for copying and pasting with newsgroups and forum messages. This determined its success, being apt for simple mechanical drawings as well a
AnimeEffects is a 2D keyframe animation tool based on deformation of polygon meshes. You can easily operate, quickly shape your idea, and remake at any time if you have changed your mind.
FIM is a lightweight universal image viewer, mostly for Linux. It is highly customizable and scriptable, and for users who are comfortable with software like the VIM text editor or the Mutt mail user agent. You can control it using the keyboard. FIM can open many file formats (even using converters) and it can display pictures graphically, with the Linux framebuffer or under X/Xorg, or in a terminal as ASCII Art renderings.
Dust Racing 2D is tile-based racing game. It provides AI players and split-screen modes, different tournament modes, and comes with a level editor. It utilizes Qt and OpenGL for smooth graphics.