Developer: Wildfire Games
Release Date: April 1, 2010
Source Code Release Date: July 10, 2009

0 A.D. is a game like Age of Empires, which is appropriate given that it started out its life a quarter century ago as an Age of Empires II mod. After close to a decade of work the team decided the AOE2 engine was too limiting and decided to expand to their own engine which they've been plugging away at ever since. As of this writing they left Alpha status a little under a month ago, and they recently got Apple Silicon support nailed down.

Note that we are linking to their download page instead of direct files as there are multiple download options including BitTorrent to save the developers some bandwidth.