PORT CANAVERAL:
Big Red Boat-Premier Cruises
Dolphin IV-Cape Canaveral Cruise Lines
Fantasy-Carnival Cruise Lines
Nordic Empress-Royal Caribean International

TAMPA:
Celebration-Carnival Cruise Lines
Tropicale-Carnival Cruise Lines

By my count, there are 34 other ships which depart from other ports to cruises to Alaska. If you need any specific information, please let me know.
The Dixie Duck is still in drydock & thus has been excluded from this list.