An SDK for creating native Steam Link applications
Linux Source 1 based games such as TF2 and Counter-Strike: Source
SteamOS community tracker
The 2013 edition of the Source SDK
OpenGL capture / playback debugger.
A runtime environment for Steam applications
Tracker for issues specific to Linux and Mac in the Reborn client
Half-Life 1 engine based games
Direct3D to OpenGL abstraction layer
Benchmarking tool for Linux OpenGL games. Spews frame information, logs frametimes.
Source for the Steamworks VR API
Issue tracking for the Steam for Linux beta client
Patched branches of Mesa used in SteamOS
CS:GO Linux and Mac clients
Issues for the Linux port of Portal 2