Agree. Alpha Centauri is still the peak of the genre for me, two decades later. It's just a shame there's no active open source effort, because the technical implementation has aged poorly.
I was looking into AC again today and noticed that there are some unofficial patches, one of which allows you to freely configure the resolution. I'm sitting here playing Alpha Centauri at 1080p and I couldn't be happier.
Yitzi patch: http://alphacentauri2.info/index.php?action=downloads;cat=2 (you'll need to download 3.5 and 3.5d, then overwrite the terranx.exe in 3.5 with the newer one from 3.5d)
Graphics patch: https://github.com/DrazharLn/pracx
Requires Alpha Centauri with the latest official patch (GOG version comes already updated).