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FPSbanana - Public
16,603 Members   |   268 In-Game   |   1,939 Online   |   979 In Group Chat
Steamworks Development
42,585 Members   |   447 In-Game   |   7,634 Online   |   6170 In Group Chat
Fanatical - Public
603,582 Members   |   12,834 In-Game   |   94,950 Online   |   6075 In Group Chat
Steam Universe - Public
1,767,760 Members   |   30,975 In-Game   |   264,850 Online   |   39575 In Group Chat
Crowbar [Source Engine Modding Tool] - Public
32,553 Members   |   1,020 In-Game   |   7,171 Online   |   3045 In Group Chat
Blender Source Tools - Public
6,448 Members   |   222 In-Game   |   1,514 Online   |   346 In Group Chat
For Developers
3,487 Members   |   20 In-Game   |   613 Online   |   14 In Group Chat
Zombie Panic! Team - Public
137 Members   |   4 In-Game   |   30 Online   |   11 In Group Chat