Forgotten magic redone. Doesn't overhaul perks adds new spells you can level up.
Apocalypse Adds a bunch of new very interesting spells to all schools does not overhaul perks.
Perkus maximus A giant giant giant overhaul of the game adds a lot of new spells redoes all the perks ALL OF THEM Just be warned this is a giant overhaul and takes a lot of work to make it work with other mods.
Wintermyst Induced in perkus maximus adds many enchantments to the game.
I know there is more but I only linked the stuff that I have used before.