Artificial intelligence: not so much is actually there yet, but it will come

Compilation, documentation and test management: gb is a generic build tool that can compile and run tests, and in the future can create documentation

Visualization

Gaming and physics

Configuration files for gvim, mucommander, emacs, bash etc.

C++: Current development is mainly for C++. Some of the earlier code was also written in C++, after some experimentation with D and D2, all effort is back on C++.

D is great, both branches for D1 and D2 exist. Currently, development for D is paused

Ruby: Great for doing various things

Linux/GNU: Arch linux, Ubuntu, LinuxMint and Kubuntu were tested

Win32 is less supported, but some things should run

gcc 4.6.3

Microsoft cl 16