Pre-Fortress 2 is a sourcemod implementing features from Team Fortress Classic into TF2

Fortress Connected is a mod that implements other source game features with support for Half life 2 and its episodes and Left 4 Dead

Better Fortress 2 is a sourcemod which makes tf2 easyer to mod and implements cut features from the game. And it is the FIRST TF2 Sourcemod on steam to be able to download

Fortress-Life Ports over the half life 2 player and its hole skew of weapons into tf2 with a half life 2 deathmatch mode.

Lambda Fortress, The mod that adds all the other source engine games into tf2 fully playable and moddable.

Open Fortress is a classic in TF2 Modding.

PASS Fortress A mod focused on the community version of PASSTIME.

Team Fortress 2 Legacy This mod is an up and coming mod trying to provide a pre 2008 team fortress 2 experience on the modern tf2 code base.

Team Fortress 2 Classic A classic in TF2 Modding having existing in "Secret" since ~31 December 2014, has now been able to release on steam.