Do to the overwhelming number of classes they will be listed by Universe that they are from.
There are certain exceptions to the classes we can make during character creation (exp if you were making a d20 modern character and wanted to make a modern day wizard a good example would be the wizards from Harry Potter)
Dungeons And Dragons
- Barbarian
- Bard
- Cleric
- Druid
- Fighter
- Monk
- Paladin
- Ranger
- Rogue
- Sorcerer
- Wizard
D20 Modern/D20 Future/ Naruto D20
- Strong Hero
- Fast Hero
- Tough Hero
- Smart Hero
- Dedicated Hero
- Charismatic Hero
Star Wars
- Fringer
- Noble
- Scoundrel
- Scout
- Soldier
- Tech Specialist
- Force Adept
- Jedi Consular
- Jedi Guardian