Year of Living Free
The Year of Living Free is a wiki and blog devoted to open pen-and-paper gaming, particular role-playing and miniatures games. The wiki used to feature libre and semi-libre works exclusively, but it steadily expanded to cover gratis closed content.
While the wiki itself does not specify a licence for its content, it lists libre and closed games as well as lists of games by licence.
Chris Sakkas, the admin of Year of Living Free, was motivated by the absence of a licence-neutral libre community that focused on non-software open content.
The wiki gathers hundreds of libre and semi-libre games in the one place.