[Arch-TK]

Redstone isn't a mod. It was added to Minecraft in a secret Friday update in the early days around alpha iirc.

[johnisgood]

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.

[1] https://ftbwiki.org/Project_Red