This Team Fortress fan animation created with Source Filmmaker is a cool tribute to the ZombiU CG trailer.
Half-Life Black Mesa
A relentless team of fans have finally released Black Mesa a remake/upgrade of the first Half-Life game from Valve.
Meet the Medic - Behind the Scenes
See outtakes and learn about Valve's creative process in this behind the scenes article for their Meet the Medic short.
Portal 2 - Boots
The science of the boots used in Portal 2 is explained in this latest video from Valve.