spring VS Spring RTS game engine

Recoil (previously called Spring) - https://github.com/beyond-all-reason/spring

If you want to develop the engine https://github.com/beyond-all-reason/spring, checkout GitHub wiki of that repository which contains compile instructions with docker, without and for MSVC setup.

Many current BAR developers are old BA devs. Many old BA players are current BAR players. Then also the engine fork happened (Recoil) (https://github.com/beyond-all-reason/spring) for similar reason as above, and Recoil+BAR currently receive the most active development, with other Spring RTS games like Zero-K also migrating to Recoil.

All is about providing a correct start script for each player: https://github.com/beyond-all-reason/spring/blob/BAR105/doc/StartScriptFormat.txt

Yes, it's using continuously developed fork (https://github.com/beyond-all-reason/spring) of the Spring RTS engine.

Well, my personal preference is for Zero-K/Spring, because I actually like micro :

http://zero-k.info/

But BAR/Spring seems like it would fit you better (it's also the closest of them to TA, which is otherwise a bit old these days) :

https://www.beyondallreason.info/

(BAR used to stand for Balanced Annihilation Reloaded, while Zero-K used to be called Complete Annihilation.)

Still a number of active projects where the game (or variations of it) are being played. Check out Beyond All Reason

Seems the support would be a realistic feature, though, because it's based on https://springrts.com/ that does support MacOS X.

springrts: Designed for 3D rts games. May be worth looking into if that's what you're making. The site is kind of lack luster so I didn't do too much digging around.

...or Total Annihilation Spring, nowadays known as Spring RTS: https://springrts.com/

My current favorite is Beyond All Reason. Before BAR, my favorite was Zero-K. Both BAR and zk use the same game engine, SpringRTS. BAR and zk are very similar to one another, and they're successors for Total Annihilation and Supreme Commander.

Obligatory mention of another open source RTS engine (lineage tracing back to the original Total Annihilation): https://springrts.com/

Non-OSS Engine?

Total Annihilation for sure, the spiritual successor Supreme Commander is great but a bit too different for me. There's an open source recreation that's a bit rough to learn at first, but it's my favorite game of all time called Spring RTS. https://springrts.com/

The other thing is that if you're going to make an engine focused on rts games, you should probably study an existing RTS-focused engine. For example, here's the source code for Spring. Learn what it does, why, and how. You might decide this is good enough for what you want to do. You might decide this is pretty close, and you'll only want to extend it rather than start from scratch. You might decide to still start from scratch, but at least you learned something about requirements/ methods/ etc.

Pretty much any game on the Spring Engine (which Zero-K is on) will work on Linux.