okay. seriously.
not pop-punk: New Found Blink Charlotte 41 etc.
pop-punk: Screeching Weasel, Jawbreaker, Teenage Bottlerocket, The Ergs, The Lillingtons, The Queers, A Radio With Guts, early Green Day, The Soviettes, Dillinger Four, The Mr. T Experience, Fifteen, Crimpshrine, The Apers, Bracket, The Broadways, Connie Dungs, The Eyeliners, Funsize, Nerf Herder, really early MxPx, Pinhead Gunpowder, Retarded, Scared of Chaka, The Smoking Popes, Softball, Teen Idols, The Vandervoorts, The Zatopeks, and more.
The Buzzcocks and Descendents are like "proto pop-punk", i suppose, and The Ramones were a huge influence on bands like Screeching Weasel and The Queers.