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