Welcome to OSRCompatible.org!
The goal of this site is to promote an open, flexible standard for Old School Renaissance publishers. OSR Compatible is a quick and easy way to indicate that a product will work with all the games, classic and modern, that OSR gamers enjoy.
Check out the OSR Compatible Logo page for details on the logo, how to use it, and downloadable image files. The FAQ has answers to your questions about the OSR Compatible standard, and the product page lists all products available with the OSR Compatible logo.