Unreal Fortress (UnF) is a class-based total conversion, based on the original Quake I Fortress, where players can choose between different classes, each with certain unique skills, but also has setbacks to keep things in balance.
An excellent and quite professional take on the fortress franchise. We have a few mods that puts some fortress into UT, but nothing is close to this one. Sure some of the classes are different, but most of the principles are here. The bot AI is descent to be honest, it's not the total best, but it works fine, however you have to calibrate well your bots in order for that to happen, other than that they will be too dumb even if they aren't bad fighters.
A mod that is mostly fun to play with people, but really even with bots it's still fun and a good quality for free that doesn't happen very often.