This is some terminology that has been confusing me up till now, since blogs and forums tended to assume a certain level of knowledge. (I stopped playing D&D in middle school, so I never really understood the various versions. So here is a chart of the editions, and the compatible retro-clones for D&D.

	Also Referred to as:	Compatible Retro Clones
Chainmail 1969	Tactical Unit Rules Rules for wargaming	None
OD&D 1974	"Little Brown Books" "Woodgrain box", or "The White Box" Classic D&D Came as 3 digest sized books (Reissued - 1978 )	Swords & Wizardry White Box Edition
D&D 1977	Blue Book Basic D&D Holmes version	(Not so sure about this category) Swords & Wizardry Spellcasting & Swordplay Epées & sorcellerie
B/X D&D 1981	Basic Set Dungeons & Dragons (Red Box) Expert Set Dungeons & Dragons (Blue Box) Moldvay & Cook's version	Labyrinth Lord
BECMI D&D 1983	Basic Set Dungeons & Dragons (Red Box) Basic and Expert were expanded with Companion, Master & Immortal sets. Frank Mentzer's version	None
AD&D 1978	Advanced Dungeons & Dragons 1st Edition AD&D	OSRIC
AD&D 2nd ed. 1989	2nd Ed AD&D Second Edition	Myth & Magic
D&D 3rd ed 2000 -and/or- 3.5 ed 2003	3/3.5	Any of the D20 products.
D&D 4th ed 2008	4E Fourth Edition	None

(There are more variances within editions - but I think I have the main iterations mapped out.)