First off, a word of warning. TempleOS and any fork I've seen does not do hardware monitoring. Meaning the OS has no clue what the CPU temp is or any other temp or power usage. Modern hardware should be able to protect itself from this, but it's a fuck around and find out kinda deal. These operating systems can fry your hardware, it's very unlikely but not impossible.

That said, the best one is TinkerOS. It's more or less the same as TempleOS but for newer hardware. Most other forks we're more or less hobby projects by various people and I don't think there's much documentation on those if at all. I'd never use any of them as a daily driver though, as neat as they were.