Im missing a lot of charm that w2 and first starcraft games had, and i did not see any open engine recreations, nor clones that lived to this day. With warcraft 3 i only ever finished half of the game, by the time sc2 came out, i was already too old to even bother trying.
Wargus and Stargus is an open source engine recreation that is still active
https://stratagus.com/index.html https://github.com/Wargus/wargus
Just so you know, StarCraft 2 is free to play now, including the terran campaign. It even has a more relaxed co-op vs ai mode with a lot of replay value for the people who can’t put up 300 apm any more in competitive play.
I think someone also recreated the entire SC1 campaign as custom SC2 maps
0AD is more Age Of Empire based but it is quite good so far. Still a work in progress.
Warcraft 2 was a blast. Not quite the same, but there’s OpenRA for your Red Alert needs.
Against the Storm (More city building focused)
Northguard (nearly a direct Warcraft clone)
Beyond All Reason (TA clone)
All magnificent.
I don’t know that I would call Northgard a Warcraft clone. The mall is divided into tiles and each tile has its own resources and building limits. Units can only attack other units that are in their tile. There’s a much bigger emphasis on building up your tech tree and taking tiles.
Still, it’s one of the more interesting and fun evolutions of the RTS genre. If sci-fi is more to your taste, Dune the newer gameby the same studio is similar.