alt Hacker NewsNot 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.
Zero K is deceptively amazing, like StarCraft mixed with supreme commander.
The lead Dev's "Cold takes" blog series are dripping with the sort of insights you only get from years of hard won iteration and if you like RTS games are a joy to read : https://zero-k.info/mediawiki/Cold_Takes