Here are a few of my favorites, all of which are/were great players that have been overlooked to varying degrees by today's listeners. I have not included some players on the list below -- for example, Ben Webster, Art Pepper, Phil Woods, Dexter Gordon, Gerry Mulligan, Cannonball Adderley, Joe Lovano, Branford Marsalis, etc. -- since I think their names are reasonably well known.
Here's a partial list of lesser known "giants of sax", with names are listed randomly as I think of them:
Sonny Stitt; Wayne Shorter; Don Byas; Don Lanphere; Johnny Hodges; Paul Gonsalves; Zoot Sims; Al Cohn; Warne Marsh; Lee Konitz; David Murray; Frank Morgan; Lucky Thompson; Bud Shank; Chu Berry; Paul Quinichette; Ricky Ford; Paquito D'Rivera; Ike Quebec; Steve Lacy; Jane Ira Bloom; Chico Freeman; Von Freeman (Chico's father); Kenny Garrett; Johnny Griffin; Jackie McLean; Richie Cole; Stanley Turrentine; Gene Quill; Hank Mobley; Jan Garbarek; Oliver Lake; Hamiett Bluiett; Frank Wess; Pharaoh Sanders; Charles Lloyd; Rahsaan Roland Kirk; and probably another 30-40 that I can't think of right now.