I looked at the “DC20” KS. It claims to be an evolution for ttrpgs, but I don’t see anything new. It uses action points and mana points, which seems to be the main “new” things when compared to D&D. Those have been around a while.
It looks crunchier than 5e, which is already too much for my tastes. YMMV, but it’s a pass for me.
They are using the ORC license, so there may be stuff worth hacking out of it.