Historically the heavyweights got all the ink. But there were a lot of great boxers from flyweight to light-heavyweight (to hell with later add-ons like strawweight, cruiserweight, etc.).
Some non-heavyweight greats in no particular order:
Archie Moore (I know he had some bouts as a heavyweight but he was really a light-heavyweight), Sugar Ray Robinson, Willie Pep, Sandy Sadler, Fighting Harada, Pascual Perez, Flash Elorde, Carlos Ortiz, Eder Joffre, Emile Griffith, Aaron Pryor, Curtis Cokes, Tony Zale, Joe "Old Bones" Brown, Harry Greb, Stanley Ketchel, Dick Tiger, Carlos Monzon, Henry Armstrong, Barney Ross, Benny Leonard, Roberto Duran, Sugar Ray Leonard, Willie Pastrano (another light-heavy who had some bouts as a heavy), Kid Gavilan,.......
Some non-heavyweight greats in no particular order:
Archie Moore (I know he had some bouts as a heavyweight but he was really a light-heavyweight), Sugar Ray Robinson, Willie Pep, Sandy Sadler, Fighting Harada, Pascual Perez, Flash Elorde, Carlos Ortiz, Eder Joffre, Emile Griffith, Aaron Pryor, Curtis Cokes, Tony Zale, Joe "Old Bones" Brown, Harry Greb, Stanley Ketchel, Dick Tiger, Carlos Monzon, Henry Armstrong, Barney Ross, Benny Leonard, Roberto Duran, Sugar Ray Leonard, Willie Pastrano (another light-heavy who had some bouts as a heavy), Kid Gavilan,.......