I have this: Blue and Green Age play ideas
for mind lords: Mind Lords, Multiple Minds, and Metaconcert
for an alternate psionic class: Creating a Psionic Binder
Also, if you want some stuff I was developing for blue-age technomagic, try this: Expedition to the Barrier Peaks Dark Sun Adaptation
unfortunately, most of these conversations are unfinished, so you’ll have to fill in the gaps.
This is just the stuff i’m personally responsible for. Dig far enough in the arena and i’m sure you’ll find a lot more