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FPSbanana - Public
17,250 Members   |   579 In-Game   |   3,196 Online   |   1258 In Group Chat
Steamworks Development
45,573 Members   |   939 In-Game   |   11,010 Online   |   6803 In Group Chat
Fanatical - Public
608,276 Members   |   18,581 In-Game   |   130,526 Online   |   6409 In Group Chat
Steam Universe - Public
1,794,128 Members   |   65,900 In-Game   |   421,905 Online   |   42674 In Group Chat
Crowbar [Source Engine Modding Tool] - Public
36,492 Members   |   2,131 In-Game   |   11,518 Online   |   3862 In Group Chat
Blender Source Tools - Public
7,128 Members   |   465 In-Game   |   2,502 Online   |   437 In Group Chat
For Developers
3,473 Members   |   45 In-Game   |   825 Online   |   15 In Group Chat
Zombie Panic! Team - Public
145 Members   |   8 In-Game   |   48 Online   |   11 In Group Chat