Up to RPG
TSR-era
and perhaps some Advanced Dungeons & Dragons too
See also my pages about The d20 System/D&D3e.
Illustrated Dungeons & Dragons edition guide
I used to think...
On thief skills
The Lost City campaign reports
The Isle of Dread campaign reports
The Skylands campaign reports
Injury table
Alternate armor
On dynamic combat
A collection of house rules
On multiple attacks
On fighting with two weapons
On energy drain
RLF1 Allhallowsmass Eve
T1 illustrations
RC Gnomes
A combat example from The Strategic Review
Excerpts from “The Color of Magic” from Dragon magazine
How Gygax played original D&D in 2005
Fudge levels for classic D&D
D&D Classics
The TSR archive
The Save or die podcast
Dragonsfoot
Acaeum
Playing at the world
Philotomy’s oD&D musings
A quick primer for old school gaming