[snippyhollow]

A few years ago SpringRTS, and in particular the BalancedAnnihilation mod [0] were active and playable. There is also Planetary Annihilation [1] (that I used to play competitively online, a few of the top players are ex-StarCraft II Grand Masters).

[0] https://springrts.com/wiki/Balanced_Annihilation [1] http://www.uberent.com/pa/

[Pica_soO]

Eh, there is also, with the same Engine(https://springrts.com/) , and improved gfx and ux:

Zero-K (www.zero-k.info) https://www.youtube.com/watch?v=jUcqY4GfRpI

TheCursed https://www.youtube.com/watch?v=EiBh8l200oo http://www.indiedb.com/games/the-cursed

BalancedAnnhilationReloaded: https://www.youtube.com/watch?v=TK0u2OYLubo

Evolution RTS: http://store.steampowered.com/app/291150/

Spring:1944 http://spring1944.org/ https://www.youtube.com/watch?v=76jFZvpvwoA

KernelPanic: https://www.youtube.com/watch?v=doF7owZ0blk&fmt=18

And various Original TA Derivatives. Try some, have fun.

[astrobe_]

I've played Warzone, Zero-K and SC2. I think Zero-K is the better of the three. Warzone's huge tech tree is overwhelming and I believe it doesn't really add to the game, because it's likely that only a few tech paths are actually viable if one talks competitive play. SC2 is pretty and all, but suffers from hard-to-solve balance problems. Zero-K has solid gameplay elements (like terrain deformation and good unit control) a great variety of units available to all players to master, and it handles nicely a dozen of players without population caps. The only problem is the small player base.

[Pica_soO]

PS: The Spring-Engine Team is always welcoming experienced contributors. And yes, that's the engines repo- not the java hibernate framework ;)

https://github.com/spring/spring

[edem]

I own Planetary Annihilation. It is a horrible successor to TA. No use of terrain, boring units and terrible UX. I currenlty play Total Mayhem (TA mod) and TA:Escalation.

[mr337]

My earliest RTS is TA and we played the heck out of it. I think the SpringRTS is a worthy successor.