It's Red Alert 1, C&C Tiberian Sun Tiberian Dawn and Dune 2000, all in one conveniently open source package. They tweaked and updated the UI and gave it a few options that are common for modern RTS games but left the core gameplay intact (they've made a few balance changes here and there - good ones, as far as I can tell right now).
I've only played a few rounds against AI, but so far it plays just as I remember it, which is great to say the least.
They are even planning to expand it to other early Westwood games in the future.
So if you're up for a true blast from the past, or if you simply want to play a really solid RTS game, this is the game for you.
TB review: https://www.youtube.com/watch?v=z1-VwE1byrY
Maybe we'll get some matches going. This would be my first round of RA multiplayer where I didn't have schlepp my PC to a friends home to play
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