Guys please make skeletal animation...
I found this old site...
http://www.bfeared.com/library/quake/archive/quakedev/gongo/It includes Quake 3 engines Skeletal Animation MD4 format... Older MD4 format unfinished but I hope you guys can finish it... Good Luck!
EDIT: There are alot of sites about MD4 format... Just type one of these:
Gongo MD4 Format
Raven MDR Format
You will probavly find source code, all source codes involved in ID Tech 3 engine are GPL... Even MD4/MDR version that was unfinished was finished in other games, find those codes try to patch them up and fix some stuff and make some stuff and you will get skeletal animation...
Better Animations, Less Space Needed... More Stuff and Diversity of Characters