The others are the Gatekeeper Mystagogue and the High Elemental Binder.
Revenant Blade is a 5-level Valenar prestige class that lets you draw on the power of your ancestors. D8 hit dice, full BAB, good Will saves.
Gatekeeper Mystagogue is for Gatekeeper druids. It lets you project arcs between yourself and your animal companion to disrupt aberrations, and provides anti-aberration abilities for both you and your animal companion. D8 hit die, 10 levels, medium BAB progression, good Will saves, full spell progression except at 1st level.
High Elemental Binder is a 10-level PrC for artificers and spellcasters. It gives you elementals as allies and allows you to quickly bind them into items temporarily. D6 hit die, poor BAB progression, good Will saves, full spellcasting progression except at 1st level.