The Altera Centauri collection has been brought up to date by Darsnan. It comprises every decent scenario he's been able to find anywhere on the web, going back over 20 years.
25 themes/skins/styles are now available to members. Check the select drop-down at the bottom-left of each page.
Call To Power 2 Cradle 3+ mod in progress: https://apolyton.net/forum/other-games/call-to-power-2/ctp2-creation/9437883-making-cradle-3-fully-compatible-with-the-apolyton-edition
I've just been reading about Civ2: Test of Time. It has a feature that the players are given their own unique technologies, and, to get these techs you have to steal or trade with them. I know that one guy here is using the idea in a fantasy mod, but are there any "regular" mods that use this?