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Alien Swarm: Reactive Drop game source code and issue tracker.
Porting Half-Life 2 base to the Alien Swarm Engine
Translations for Alien Swarm: Reactive Drop (2017), a mod of Valve's Alien Swarm (2010)
Alien Swarm: Reactive Drop developer information website
Alien Swarm: Reactive Drop community wiki
A singleplayer mod for the game Alien Swarm: Reactive Drop