The Lazy GM: Freaks and Horrors, exclusively for Pathfinder.
Within are hundreds of stat-blocks for forty different monsters, from classics such as the Aboleth and the Harpy to oddball monsters like the Algoid and the Disenchanter, selected from all four Pathfinder Bestiaries, and the Tome of Horrors too!
Freaks and Horrors makes good use of all the exciting options available in Pathfinder, with archetypes like the Medusa Lotus Geisha or Intellect Devourer Spy, templates like the Nightmare Xill or the Demonic Cave Fisher, and new classes like the Jackalwere Gunslinger or Flail Snail Oracle. It also features a wide range of classes and levels for the lesser-used Darklands races such as the Dark Folk, Dire Corbies and Morlocks, as well as a CR17 variant of the Flumph that your players will take very seriously indeed!
In standardised Pathfinder stat-block format for greater compatibility, Open Content for all stat-blocks, CR 1/2 to 23, with a fully clickable index cross-referenced by CR, templates and monster roles to easily find what you need.
Buy it from DrivethruRPG or RPGNow, nearly 400 pages for only $9.99!