Take a look at some of the odds and ends I've made for myself and the Worlds Without Number community.
• FOCI • Some additional choices for defining a character and their origin
• CLASSES • Options for extraordinary careers not present in the core rules
• SPELLBOOK • Several spells and arts for the mystically inclined.
• HOUSE RULES • The kind of things that spice up my games a little
• ADVENTURES • Need something to run? I might have you covered
• CREATURES • A collection of beings you may encounter in my games
Be sure to check out the WWN Discord, /r/WWN, and get yourself a free copy of Worlds Without Number!