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
edit: actually, I realise this isn't as straightforward as you might think. I think *lots* sums it up though.
Concrete, Abstract, or Squoingy? "I don't believe in giving scripting languages because the only additional power they give users is the power to create bugs." - Mike Breitkreutz, Firaxis
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