Portal joins forces with Half-Life in this short film called When Gordon Met Chell.
Portal: Survive! is a live-action short film based on the Portal game, and its tie-in comic Portal 2: Lab Rat.
Beyond Black Mesa
Check out Beyond Black Mesa, an action packed short fan film based on the Half-Life series.
Valve have created Expiration Date, a 15 minute animated short featuring all the Team Fortress characters.