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I find Eden Eternal's class system pretty novel.
You start out with two class choices (fighter and mage) and an extra class opens every 5 levels.
You can have as many classes as you like and have independant levels in each class.
The higher classes have pre-requisites and sometimes multiple prerequisites.
You get enough exp when progressing that you can level one class to max and about one other class to almost max, or spread it among several. Of course when you reach the current level cap you can work on any class.
There is a generic bonus you get based on the total progress among the classes at 1 point per level per level (IE you gain level 25 in a class, you get 25 extra CE points) 6560 is the boundary for CE 11 by example which gets you more bonus hp/mp attack and healing bonus than CE 10 does. Of course the higher CE levels are a pain in the rear. With a level cap of 50 I have pretty much all of the subclasses to 30 and I am just shy of CE 11(I have hunter 50, priest 42(40 opened shaman), thief 35(to open martial artist), shaman 31, martial artist, fighter, knight, mage, engineer, 30, illusionist 27, bard 26[dunno why they gave bard medium armor -- my medium armor is set up for my hunter/thief/ma classes and is very badly statted for bard and I am not going to keep 2 sets of medium [it keeps one of each set on your character] but regardless it takes a lot more than up to the level cap to get a decent bonus.