A free mod for Witcher 3, by Doryani.
This mod is an update for the original one by Doryani and is updated for the new versions of the game.
What are the differences?
Feline: This is where you can use higher-leveled items. You can use them in combat or in alchemy. You can focus on two skill trees at once.
Griffin: This is almost same with the default settings, wherein it offers smoother curve and slightly reduces the XP needed for a level.
Ursine: The goal of this setting is to slightly eliminate the problem of slow levelling than default.