Here's my take on the Ranger for my upcomming low-magic campaign:
Rangers get Uncanny Dodge as a Barbarian instead of spells. (Inspired by this thread)
Rangers add a free rank to Wildernes Lore each level. (Max rank is still 3+lvl)
Rangers get Giantkin as only favored enemy. Giantkin are: Bugbears, ettins, giants, gnolls, goblins, hobgoblins, kobolds, ogres, orcs and trolls. Improves every 4 levels.
(Keep in mind that this is for a specific campaign, in which I see Rangers as they were in LotR; protecting people in rural areas from the creatures often encountered there. Is letting it improve every 4 instead of every 5 levels too much?)
Rangers' two-weapon fighting applies to quarterstaves, as well, but when wielding two weapons, both must be light, or one medium and one two sizes smaller (E.g for a medium sized character: Two shortswords or a longsword & a dagger).
(Again, this is for a specific campaign where I don't allow double weapons, plus I feel that the longsword/shortsword combo is a bit cheesy)
Rangers can choose between virtual two-weapon fighting+ambidex or point blank+rapid shot (same restrictions apply).
Rangers gain Fast Track special ability at 5th level, negating the -5 penalty when moving at normal instead of half speed.
And here are my changes to the Bard, so far:
Bards get 6 skill points per level.
Bards get the Ambidexterity feat for free at first level.
(It seems that this could come in handy/be easily developed when juggling or performing various acrobatics. Plus it lets Bards be good at two-weapon fighting for a cost of just one feat, which fits my view of a swashbuckling Bard: Rapier & dagger)
Btw, if anybody's still interested in non class related houserules in this thread, let me know and I'll post some of those as well...