Portal: Survive! is a live-action short film based on the Portal game, and its tie-in comic Portal 2: Lab Rat.
Portal: Terminal Velocity
See what three guys can do with a portal gun in this funny and clever short film, Portal: Terminal Velocity.
Portal 2 - Valentine Trailer
Valve have shown us they're true romantics, with this special trailer for Portal 2.
Team Fortress 2 - ZombiU Crossover (Source Filmmaker)
This Team Fortress fan animation created with Source Filmmaker is a cool tribute to the ZombiU CG trailer.