My first try to archive AABB collusions (I hate OBB). It's based on old C-Script of Mat-Allum a.k.a. Some Moron. I've implemented gravity and some other stuff, but it still has some bugs and it's very WIP. I hope someone will find this useful, and some of experienced users would try to help me with developing this farther, cause my knowledge isn't good enough.
Here is download link:
Download link
Controls:
WSAD - movement
CTRL - crawl
SPACE - jump
C - toggle camera modes