Zimerius: Everyone seemed to have managed to miss mentioning Conquest:Frontier Wars. A prelude to Stellaris so to speak. Very 4x Very rtsy and very classy. I belief you do need dgvoodoo to launch the game in a 1080p+ res.
you can find it ----------------->
here :)
Lucumo: Played it back in the day. It's basically Brood War in space (well, proper space), except that it also had hero units. Definitely overlooked but at the same time, they probably didn't do any marketing. My game box also only contained the game CD itself in a case and nothing more, not even an inlay. So...yeah.
Sequel got announced but it was eventually cancelled. The kickstarter for it failed spectacularly later on. A shame, because I would have liked one.
Bonus: The game had no DRM, so no no-CD patch required.
Darvond: Fragile Allegiance, though I preempt to say that I never bothered with fleet management or combat.
To step in line with the others btw, 4x space rts ?? then Stellaris and Sins of a Solar : Empire(Rebellion) are a must!!