Maxperson
Morkus from Orkus
DM's guild shows the following and I really didn't look far down the list.Unless you're creating a new entry point to 5e outside of WotC (like A5e and TotV), I don't think so.
I would very much like to be shown otherwise though! Love me some alternate design.
"Play as an Intelligent Weapon!" - alternate fighter class as a weapon.
"Classic Classes present variant classes for a fifth edition, seeking to recapture some of the charm and narrative looseness of first edition. “Long ago, in editions the first, classes had charts varying for experience, and many determined their statistics in order. Couple these factors two, and with minimal requirements of entry, fighters were a class most common."
"A quick and simple overhaul of the Fighter class, to make it a bit more fair, balanced, and fun, while staying within the spirit and confines of D&D 5e"
That's three just with a brief look. I'd bet that most classes have alternate versions.