White Box (often referred to as original d&d or OD&D) (1974)
- Gygax and Arneson
- contained 3 half page books (8 1/2" x 5 1/4")
- Only three classes existed: fighting men, wizards and clerics.
- AC starts at 9 and goes down. (Stolen from Chainmail)
- additional supplements introduce the thief, druid, illusionist, etc.
- exceptional strength appears in the supplements.
Advanced Dungeons & Dragons (1977) 1st edition
- Gygax
- MM, PHB (1978), DMG (1979), FF, MM2
- AC starts at 10 and goes down.
- To hit charts are weird: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 20, 20, 20, 20, 20, 21, 22, 23, ....
- Multiclassing is limited to non-humans. Humans could dual class.
- main classes: Fighter, Paladin, Ranger, Cleric, Druid, Wizard, Illusionist, Thief, Assassin, Monk, and the Bard prestige class.
- Unearth Arcana (1984?) introduces Barbarian, Cavalier, Thief-Acrobat, Non-weapon Proficiencies, Comliness
- Dungeoneers Survival Guide, Wilderness SG, Manual of the Planes (c. 1987-8): Hybrid 1st/2nd edition AD&D material. More non-weapon proficiencies.
Basic Dungeons & Dragons (1978) Blue book with dragon
- Gygax
- Only book in the series. AC starts at 9 and goes down.
- Alignments reduced to Lawful, Neutral and Chaotic.
Dungeons & Dragons (1981) Red box and book (2nd edition of the blue book game)
- author forgotten
- Only details levels 1-3
- Continues with Expert (4-14), Companion (15-?), Master and Immortal sets. (I only had basic and expert.)
- 7 classes: Fighter, Wizard, Cleric, Thief, Elf, Dwarf, Halfling (yes, the races were classes: Elfs were ftr/wiz, Dwarves were Fighters and halflings were ftr/thf)
- AC starts at 9 and goes down.
Advanced Dungeons and Dragons, 2nd edition (1989)
- David "Zeb" Cook, et. al.
- Introduces THACO. AC starts at 10 and goes down.
- Main classes: Fighter (Paladin, Ranger), Cleric (Druid), Wizard (8 Specialists), Thief (Bard). (Gone are Barbarian, Assassin and Monk)
- non-weapon proficiencies in the PHB (yet still considered optional)
- Lots of splatbooks containing kits.
AD&D 2nd Edition Powers and Options (1993?) (AD&D 2.5)
- Points buy based class customization.
- Abilities scores split in half
- high level stuff (10th+) addressed for the first time.
D&D 3rd Edition (1999)
- Tweet, Cook and Williams
- All XP charts collapsed into single chart
- Multiclassing is no longer simultaneous
- Eliminates exceptional strength and exclusive fighter bonus for high str and con.
- Ability Score modifiers are uniform for all abilities.
Edit: Assassin info added to 1st ed AD&D