Duel-wielding weapons

I am here asking a simple question, including the Fighter’s Advanced Weapon Training(s) how many classes/feats/features allow to do duel-wielding otherwise ineffective weapons? (Two Non-light one handed weapons are in focus for my own needs, but all are welcome!)

(Any Feature, though preferably not 3rd party, is available!)

if specifics will help, I am wanting to play a Character who duel-wields Khopesh, but I was thinking that Ranger may fit the personality/background better then fighter.