If you aren't familiar with Petty Gods its a New Big Dragon Games collaborative project (out of the ORC...Old School Roleplaying Community) outlining over 300 deities for your sandbox campaigns. I couldn't help but notice that the PDF version is currently free right here and the print version is up at Lulu for a very attractive price as well. I've got my physical copy ordered, and the PDF is tantalizing. You should check it out.
For those of you with a score card, New Big Dragon Games is where the OSR Creature Compendium, D30 DM Companion and D30 Sandbox Companion come from. Everything I've gotten from NBD has been pure gold and is being used at my game table (and with D&D 5E no less, although plans are in the works for S&W too).