Development of 0 A.D. is currently entirely volunteer based. This is a community project, through and through. So if you are a game developer, a programmer, an artist, a modder, a translator, a documentation writer or even a historian, a blogger or a Youtuber, don’t hesitate to contact us on our forums: https://wildfiregames.com/forum/
If you want to get right into it, visit trac for more specific information:https://trac.wildfiregames.com/
Our code is discussed on Phabricator:
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