Forgotten Gems of the OSR - The Holmes Companion
For those not familiar with it, Meepo's Holmes Companion (HC) is a small supplement for Holmes Basic D&D that expands the original rules from level three to level nine. It was meant to give referees a simple but complete OD&D-based dungeon-crawling game, and it certainly does that in spades.
Forgotten Gems of the OSR - Oubliette Magazine
Oubliette was a zine edited and published by Peter Regan from 2010- 2012 (with a stray issue published in 2015). Nine issues were published in total, all available in print or PDF from DTRPG or the editor's blog (as of this writing, a discounted PDF bundle of the first eight issues of Oubliette is available). Oubliette is dedicated to Labyrinth Lord, but of course will be useful to any B/X-type games. There were two compendiums published, each with four issues - my own hard copies are the compendiums.