The only two places I know to play online are here https://www.axisandallies.org/forums/topic/17147/gargantua-s-k-i-s-s-triplea-instructions/30
I would’ve posted this in a TripleA forum, but couldn’t find a dedicated one, so I figured this was as good a place as any to ask. Who created TripleA? Was it WotC, or a group of fans who wanted a new way to play online, or what? I looked on the TripleA site, but it didn’t really help.
You could have asked this in the “Software” subforum.
Anyway, here are some links that may answer your questions:
… and there is a development forum, too:
TripleA is far more than just A&A. It is created by some enthusiasts. At the moment the lead developer AFAIK is Veqryn, who is active in this forum, too. There are many people contributing with own maps or tweaks or mods.