A menagerie of Horrific and Beautiful Monsters for the World's Greatest Roleplaying Game.
This bestiary is surprisingly well produced considering it is a fan-made product. Much of the artwork used probably is copyright-infringing. Several versions have been produced, generally at about one month intervals (the distinctive cover was added at the version 0.9 release). Typically, each version adds new material. The latter versions have file sizes that are quite large, leading to the release of a "high density" and a "light" variation - one for on-screen reading and one for saving space. The product is announced, coordinated, produced, and released via an established sub-reddit.