Dungeons & Dragons
- D&D Building Tools: Map Editors, Campaign Managers, Worldbuilding, etc.
- D&D Compendium or RPGBOT - D&D Tools & Learning Resources
- 5etools, DM Screen or The Acaeum - Rules & Content References
- D&D Beyond: Official Toolset for 5E
- Kobold+ Fight Club: Encounter Builder & Balancer
- Avrae: D&D Automation Discord Bot
- DnD-Books or D&D 5e BR / Use Translator: D&D 4E/5E Books
- Cruinne's D&D Reading Room: D&D Worldbuilding Checklist
- DiceCloud: D&D 5e Character Manager / GitHub
- DMHeroes: D&D NPC Generator / Classic
- Tetra-cube: Monster Statblock Generator
- GM Binder: 5E Homebrew Document Editors
- D&D Wiki: D&D Homebrew Wiki