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
If it's possible, I would like to see a mod where rival civ's can't land on a tile occupied by your player unless you have an open territority agreement with them. It's frustrating that you can't use a low level troop (like a scout) to block an area from expanding civs.