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.
I would add the 1999 game Warzone 2100 to this list. Much like Earth 2150 you can design your own units and it also has the persistent homebase + mission outposts system. It was open-sourced in 2004 and has received quite a bit of love since then.