Are you and your friend looking for free-to-play co-op fun? Then, try out the following fantastic games on Steam.

GameSpot may get a commission from retail offers. If you've been looking for an online co-op game with some Alien vibes, the upcoming top-down tactical shooter DarkSwarm might just tickle your fancy.

Roadside Research is an upcoming simulation game that blends workplace management with undercover extraterrestrial activity. Developed as a chaotic single-player or co-operative multiplayer experience ...