The Best Open-source Games for Mac OS

A free open-source circle-clicking rhythm game practice client for osu! beatmaps with Virtual Reality support. McOsu is developed separately from and has no direct affiliation with osu! or ppy Pty Ltd.

Based on cult classic Space Station 13, Unitystation is a multiplayer RPG about life in deep space. Be an engineer, lawyer, surgeon or clown and keep the station safe from saboteurs. Each round is filled with paranoia and lighthearted fun, even as you get thrown out the airlock.