Tools for New D&D Dungeon Masters: SlyFlourish.com
NPC Charles on Twitter: "To all the DM's out there, here are some sheets for ability checks. Setting DC's, types of checks, and references for gauging difficulty. Another great sheet to have
Community Forums: DND 5e CHEAT SHEET - free tool for everyone to use | Roll20: Online virtual tabletop
A D&D 5e Online Tool | Adventurer's Codex
5 DM Resources for D&D 5e ready to Print & Play Today | Mage Productions
Photo guide to dungeon master's tools | DMDavid
Top 10 Dungeon Master Physical Tools of the Trade for D&D - The DM Lair
Top 10 DIGITAL D&D Dungeon Master Tools of the Trade - The DM Lair