I've converted the Academician from Green Ronin's Black Company campaign setting. I did so for use as an NPC and to give PCs the option of choosing a skill based class that isn't a Thief.

( AcademicianConversion )

I've also converted Green Ronin's Psychic class. I feel that their interpretation of psionics is far more subtle and less potentially overpowering than the XPHB's psionic classes and powers. Where applicable for my setting, I've culled some of the skills normally available, such as various teleportation skills and elemental channelling skills. I also cut out a few of the Psionic Feats that were either tied to skills that I'd cut out or just didn't fit.

( PsychicConversion )

Thirdly, since I have a deep love for Green Ronin's magic system as presented in The Black Company campaign setting, I've gone about converting the Wizard class from that system. Anyone who is also tweaking Black Company's magic system for use in their IH game my find it useful.

( WizardConversion )