Purely on some variation of the strength/invulnerability/flight/speed/ combo platter powers.
Wildstorm's Mr. Majestic
Image's Captain Dynamo
(On a quick sidenote, there's a subplot in the Image mini Dynamo 5: Sins of Our Fathers, which deals with how three Superman analogues, Omni-Man, Cap Dynamo, and Supreme, teamed up to deal with a galactic invader character.)
Mark Millar and Lienel Yu's new character Superior seems to be yet another Superman clone too.
Marvelman/Miracleman is an expy of Captain Marvel who's an expy of Superman.
And as far as alien from another planet arrives on Earth with the combo platter of powers, technically you have Goku, and then Omni-Man and Invincible too.
Tales of Judgment. Also here, instead of that other place.
good luck D.B.B.
Some comics create Superman alternates specifically as antagonists: