Besides the obvious Clash, Ramones, and so on.
Some of my favorites are the Ducky Boys, Bouncing Souls, Rancid, Lars Frederiksen, Street Dogs, NOFX, Bad Brains, Negative Approach, Everybody Out, Turnpike Wrecks, Millencolin, the Briefs, Hank III, Pogues, FM, ?Frank Turner?.
I listen to a lot ska, probably the reason I listen to a lot of punk, such as Rancid, the Clash, Joe Strummer's other stuff, Specials, Desmond Dekker, Toots, Trojan, Ken Boothe, Mad Caddies, Left Alone, Pietasters, Aggrolites, and Slackers.
Vic Ruggiero from the slackers is the fella that plays the keys on the Rancid albums.
I know some don't see it, but to me real ska and punk is like beans and rice.
I haven't heard that name in a while.