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.
RevCast is the second spin-off of the Civ strategy-centric PolyCast; the modding-centric ModCast was the first such spin-off. Unlike either of its older siblings, RC has no defined segment categories.