I had the idea of subsuming paladins and rangers into the fighter class, each as a series of feats. I tried not to do direct conversions (e.g. no "Divine Grace" feat that simply grants Divine Grace). The feat chains allow for low-magic "paladins" and "rangers" i.e. no spellcasting, though they still have some supernatural abilities. They can be subdivided into additional feats as they're probably too powerful or too accessible to spellcasting classes; fighters can afford to spend even more feats on them anyways haha. I think ideally paladins would be absorbed by clerics and rangers would be absorbed by druids (leaving just weapon styles and favoured enemies for fighters).

To-do: more paladin feats? (special mount, turn undead, etc.), more ranger feats (Trackless Step, animal companion, etc.)