Scrapbook DMG

You could probably put together the best DMG ever using only blog posts and other free internet things. Here's an index of freely available DM advice and resources that have been invaluable to me as I wade back into the game after years away. It's by no means exhaustive, and I'll keep it updated as I find more stuff.

Introduction

Advice for the Newly Afflicted - Renfield's Cat
On a Guide for New Dungeon Masters - Hack & Slash

Prep Advice

Don't Prep Plots - The Alexandrian
LotFP Referee Book - James Raggi
RPG ABCs - Basic Red
What Is Tested? - Goblin Punch
World Building and Old School Games - Mazirian's Garden

Running Advice

5 Tips for Horror in D&D - Strange Magic
Gaming Advice #1 - Don't Be A Dick Head - Monsters and Manuals
On DMing - Monsters and Manuals
Quantum Ogre series - Hack & Slash
Quick Primer for Old School Gaming - Matthew Finch
Why I Love Simple Initiative - Playing D&D With Porn Stars

Prep Resources

100 Problem & Puzzle Set-ups - Playing D&D With Porn Stars
1d122 OSR-Style Challenges - Goblin Punch
Choose Your Own Generator - Last Gasp
Die-Drop Instadungeon - Playing D&D With Porn Stars (online version here by Jensan)
Ecosystem Generator - I Don't Remember That Move
Forty Fallen Empire Magic Items - Dungeon of Signs
Instaregion - Playing D&D With Porn Stars
Some Rival Adventuring Parties - Dandy in the Underworld
Stock The Dungeon With Rooms That Don't Suck, Fast - Playing D&D With Porn Stars
Treasure - Courtney Campbell (Hack & Slash)
Tricks, Empty Rooms, & Basic Trap Design - Courtney Campbell (Hack & Slash)

In-Game Resources

Cowardice, Treachery, Ineptitude, Insanity (hireling freakouts) - Rotten Pulp
D100 Nested Treasure Table - Playing D&D With Porn Stars (Abulafia here)
Hidden Traits Of NPC You Didn't Realize Was Going To Be Important Until You Actually Started Playing - Playing D&D With Porn Stars
How Do I Break This Curse? - Playing D&D With Porn Stars
Party like it's 999 - Jeff's Gameblog
So You've Decided To Rest In Town Before Going Back Into The Dungeon! - Playing D&D With Porn Stars
Urbancrawl Rules for Slacker DMs - Playing D&D With Porn Stars
What's a Dazzling Urbanite Like You Doing in a Rustic Setting Like This? - Dandy in the Underworld
Where The Hell Have You Been, Flake? - Playing D&D With Porn Stars

Hexcrawls

Hexenbracken

The Kraal

Colossal Wastes of Zhaar

(All hosted on Save vs. Total Party Kill)

Adventures and Dungeons

Better Than Any Man - James Raggi
Five Churches of Tiamat - Playing D&D With Porn Stars
Palace of the Silver Princess - lots of people
Sky-Stone-River-Place - False Machine
Sleeping Place of the Feathered Swine - Logan Knight
The Submerged Spire of Sarpedon the Shaper - Mazirian's Garden
ThroneCrypt of the Afflicted Lord - Playing D&D With Porn Stars (partially keyed)
Unfinished Location File - Playing D&D With Porn Stars (unkeyed)

Monsters

Faerie Knights - Monsters and Manuals
Random Mythical Wizards in 7th Century Northern Japan - Monsters and Manuals

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