Not sure about this one, but there is another engine that started as a Total Annihilation clone: https://recoilengine.org/

Some of the (open source) games on that engine (https://beyondallreason.info/ and https://zero-k.info/) have similar feeling with the original TA, with quite different play styles. I do prefer Zero-K over Beyond All Reason, but I would recommend anyone interested in the genre to try both and decide for themselves.