I’ve been writing this blog this since 2012, so there’s a lot of material here. If you want to cherry pick and just look at the very best, here’s the ones that people keep coming back to, in order of descending popularity.
Trying to Map Middle Earth: When we started playing MERP again, I tried to put together the most awesome Middle Earth map ever. Here’s why I failed, and some great resources that might help your effort.
Beleriand: The Campaign Map Version 2: Created for our Beleriand campaign in Paint.net, it taught me that Beleriand was best forgotten, as it was just the rough draft for Middle Earth.
Ruined City Generator: Just a page that sends you to the efforts of other folks.
Wizard’s Spellbook Generator for Pathfinder, 1st edition, c2014: A set of Excel sheets. Hands-down the most popular download so far.
Selling Wizard’s Spells in Greyhawk, Pathfinder Style: Can you tell I often play a mage?
What a Medieval Shield might have looked like: Self-explanatory.
The AD&D Experience, Part 5: And what is Splint Mail anyways? Splint mail is an artifice the armor class system of AD&D. I much prefer calling it Jacke.
John Eric Holmes, Confessions of a Dungeon Master (1980): A classic article from Psychology Today that is really hard to find nowadays.
Gamma World Cryptic Alliances Redefined: A non-canon revision of the Cryptic Alliances, drawing from all editions of the game.
Iron Rations in D&D & Pathfinder: Trying to figure out where that term came from.
The Play is the Thing, pt 1: A three-part discussion of role-playing.