Some nifty finds online:
Fantasy Worldbuilding Resources. This batch includes a including a language generator, map maker, and my favorite, the speed distance calculator (how long it would take someone to get somewhere).
Master List of Facial Expressions. So every description is not just ‘he smiled or she looked’. (raises hand, guilty).
Halcyon Maps (lethal dosages of poisons). JUST in case your characters ever need to poison someone.
Any good finds on your side?