Spess is an experiment in gamemode creation for Garry's Mod, a Half Life 2/Source Engine mod. I'm seeking inspiration from Space Station 13 and Trouble in Terrorist Town (in both game concept and programming).
Clone or download and unzip this repository into your ...\SteamLibrary\steamapps\common\GarrysMod\garrysmod\gamemodes\ directory, then just launch Garry's Mod and select Spess from the list of gamemodes in the bottom right corner.