The official website is https://www.beyondallreason.info/
It's an open-source project that started as a fork of SpringRTS. To my eye it looks nearly like a clone of Supreme Commander.
I watched a few ranked 1v1 games on uThermal's YouTube channel (he's a former Starcraft 2 pro who mostly makes YouTube videos about Starcraft 2). Here's the playlist.
https://www.youtube.com/playlist?list=PL_USFDBbymGUwLPiopP2q...
Well, when I saw the first Supreme Commander video it looked a lot like Sprint RTS running Balanced Annihilation to me. Right down to how the terrain deformation worked and the command queuing.
Was there any particular reason for the fork? There's a lot of Spring RTS projects but they all use the same codebase. http://springrts.com/wiki/Games