Game Rules
- Online SRD
- Basic D&D 5e rules
- Here is my very own D&D Rules Summary — See https://dicehaven.com/stan-shinn-rpg-downloads/ in the ‘D&D’ section
Spell Lists Tools
- http://hardcodex.ru/
- https://www.thievesguild.cc/spells/spellcards
- https://dnd.sharov.dev/
- https://colinmarc.com/dndspells
GM Tools
Treasure Tables and GM Tools
- https://dungeonmastertools.github.io/
- Magic Item list with links to D&D Beyond descriptions (in some cases)