Birds of a Feather - From Lesser Gnome, this seems to be a high production value adventure. 21 pages, $4.99
Bloodnut Pass - The name hints at it, but it has a disclaimer that's it not for children. 17 pages, $1 from Chubby Monster Games
FP6 - Lair of the Arcanous the Black - With a name like that, I'd guess he was a necromancer. For mid level characters, 18 pages and $3.
Junkyard - This seems to be an eerie location, featuring stats for several systems, including OSR. 14 pages, $1.50
Skull Cove - This is a short multi-system adventure (including OSR, it seems). 14 pages, $1.50
Classes of Fantasy -Assassin, Cleric, Elf, and Jester - These are all from PJS Games and meant for Labyrinth Lord. Each is Pay What You Want.
CRGE - Conjectural Roleplaying GM Emulator - Not really OSR, but rules neutral. Might be help for those playing solo games like Kwantoom
How in the Name of the Trollgod, Did I get Here - Nominally for Tunnels and Trolls, this is character background generator for fantasy games. $2, 50 pages.