https://www.dndbeyond.com/ 

Great for official D&D character creation. 

https://www.n7.world/manual/intro

Mass Effect 5e (Fan Run)

https://sw5e.com/

Star Wars 5e (Fan run)

https://battlezoo.com/

Great for Pathfinder and 5th edition material, I specifically use the  "Battlezoo Ancestries Dragons 5E v4" for Mary. 

Also I'm using 

http://www.dyskami.ca/anime5e.html

Excellent book for mixing systems thanks to the Character Points system. Really easy to achieve a semblance of Balance.