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FPSbanana - Public
16,320 Members   |   395 In-Game   |   2,482 Online   |   888 In Group Chat
Steamworks Development
41,418 Members   |   639 In-Game   |   7,743 Online   |   5854 In Group Chat
Fanatical - Public
605,778 Members   |   27,128 In-Game   |   133,893 Online   |   6006 In Group Chat
Steam Universe - Public
1,758,621 Members   |   64,109 In-Game   |   385,839 Online   |   38285 In Group Chat
Crowbar [Source Engine Modding Tool] - Public
30,832 Members   |   1,482 In-Game   |   8,939 Online   |   2708 In Group Chat
Blender Source Tools - Public
6,122 Members   |   323 In-Game   |   1,799 Online   |   313 In Group Chat
For Developers
3,498 Members   |   46 In-Game   |   628 Online   |   14 In Group Chat
Zombie Panic! Team - Public
137 Members   |   4 In-Game   |   38 Online   |   11 In Group Chat