History of video games/Open games

Intro
Open Source games are interesting from a historical point of view, because they allow the examination of a codebase and development cycle over time.

0 A.D.
Read more about 0 A.D. in its Wikibook.

Minetest
In 2011 the first early release (0.2.20110731_3) of Minetest was posted to Github.