Ranking the best open-source video games can be subjective, as different people have different preferences. However, here's a list of some popular open-source video games, in no particular order, that have gained recognition and appreciation from the gaming community:

1. [Battle for Wesnoth](https://www.wesnoth.org/) (Turn-based strategy)
2. [0 A.D.](https://play0ad.com/) (Real-time strategy)
3. [SuperTuxKart](https://supertuxkart.net/) (Racing)
4. [OpenRA ](https://www.openra.net/)(Real-time strategy) 
5. [FreeCiv ](http://www.freeciv.org/)(Turn-based strategy) 
6. [Xonotic](https://xonotic.org/) (First-person shooter)
7. [OpenTTD](https://www.openttd.org/) (Business simulation)
8. [Warzone 2100](https://wz2100.net/) (Real-time strategy)
9. [The Dark Mod](http://www.thedarkmod.com/main/) (Stealth)
10. [Cataclysm: Dark Days Ahead](https://cataclysmdda.org/) (Roguelike)
11. [Red Eclipse](https://www.redeclipse.net/) (First-person shooter) 
12. [Cube 2: Sauerbraten](http://sauerbraten.org/) (First-person shooter)

These games cover various genres, and their source code is available for anyone to modify or contribute to. Keep in mind that this list is not exhaustive, and there are many other open-source games out there.
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