Half-Life: Raise the Bar is a fan-made short film inspired by the Half-Life franchise.
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.
Street Fighter: Assassin's Fist
The live-action Street Fighter: Assassin's Fist series has been released in its entirety on the Machinima Youtube channel.
Valve have created Expiration Date, a 15 minute animated short featuring all the Team Fortress characters.