I don't have an opinion about which open source games are best, but here are 5 relatively well-known games where the source code was made fully available: 


1. **NetHack** 

    A dungeon exploration game.

1. **Armagetron Advanced**
    
    An open source 3D light cycle racer in the style of Tron.
2. **Minetest**

    An open source voxel game similar to Minecraft.
3. **SuperTuxCart**
    
    An open source racing game.
4. **Friday Night Funkin'**

    An open source rhythm game.
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