Full Metal Plate Mail available in hardcover at Lulu

Full Metal Plate Mail being an OD&D retro-clone (3 LBB only) by Leonaru. The PDF version is free, and the hardback version is $13 or so

Updated Cthulhu Bestiary available

The somewhat prolific author Leonaru first produced this free supplement a couple months ago, but now has released an updated version over at Lulu. Covers a lot of ground.

Zero Edition Ninja released

Based on the original Ninja from Dragon Magazine comes the free Zero Edition Ninja from Leonaru.

Second and Zero Edition Samurai released

 Although never an "official" class until OA, it was a very popular unofficial class, so much so there was one in the Wizardry game (which basically used the D&D rules) and some early D&D fiction.

Leonaru has released a 2e version and a 0e version, both free from Lulu.

Edit: And here is a 1e version.

Second Edition Alchemist Released—Free Character Class

From Leonaru who brought us various first edition classes, comes the 2nd Edition Alchemist, which was from the Tome of Magic apparently.

First Edition Duelist now available (Free Osric Class)

From Leonaru, the creator of other various 1st Edition classes which bring various additional classes to OSRIC, comes the 1st Edition Duelist, a class from Dragon Magazine.

I used to play some of the classes from Dragon. I can't remember if I played a Duelist, but I played a Psionicist, a Ranger-Archer, and a Smith.