Mathacks are very easy to make for almost any game that uses the source engine, and I have a few for games that don't really have their own category. I'd like to share these, but I'm not really sure where to put them, and it'd be nice to be able to have them all together somewhere.
This is what i have at the moment, with more in the works.
Left for Dead 2 (and NMRIH mod)
Counter Strike Source
Team Fortress 2
If no one want's to make a new section for them, that's fine, but where should I post the ones that don't have their own area (currently L4D2 and ND).