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
It depends on what you mean by add units. New units can be added to CIV3 with the editor, but I guess you're really asking if the graphics will work. The quick answer is no since the graphics are different formats. The long answer is yes since you could convert them with a lot of effort but they wouldnt be animated without a huge amount of effort.
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