Good equipment can get you a lot of bonus stats. Let me know if you know of more bonus items.
Shields:
Juktal's Shield (Mjharr +5 dex)
Marcus Aurelius' Shield (Marcus Aurelius in Imperial Forest +4 dex)
Haunted Asmar Shield (Trapper Joe in Asmar random drop +5 int/wis and block special that gives back mp)
Asmar Shield (Lots of mobs in asmar, +5 to strength, chance to block firebreath)
Equipment:
Rare rings from a jewelry shop in the new area Fairdale. Ring of charisma, dexterity, intelligence, etc... all give +2 to that specific stat. Cost 750k each. Magnificent Tiara can also be bought there for a +4 to charisma. Auto at 90.
Jeweled Tiara - random drop off of Estelle in water area in Aerioth II. +5 to charisma. Must be a female for it to autoload.
Crown of Ivy - Random drop off Garden Caretaker (or something like that) in Abbey in Aerioth II, +1 to wisdom
Mithril Leggings/Tunic - Fairdale item, +1 to dex and maybe another stat? Might have been changed to be fighter only now
Miscellaneous:
Shandan Castle - kneel statue for a +1 to wisdom
If you max your Alchemist's Tome in Shanadan, the potion of experience will give you a +4 bonus to all stats
Various bard songs give a bonus to stats - ask a bard for them
