Yes, ComputerCraft! I have written so much Lua because of it. Only if I still had the scripts. :(
I had no idea RedPower is not a fork, I just remember having switched to it because of no updates for Redstone or version incompatibility issues or something? It's been a really long time ago.
Oh hold on. I was confusing Redstone with https://ftb.fandom.com/wiki/RedPower_2 and Project Red[1] that came afterwards. How embarassing. :P So it was RedPower -> RedPower 2, and then Project Red. It added a lot of goodies! You should check out the links.
