D100 RPG's 2; Open Quest
The Open Quest D101 thread.
Open Quest uses a simplified set of mechanics, much like a bare bones BRP-RQ hybrid.
The basic Open Quest game is a solid, simple fantasy system. A little too simple for my tastes (Bare Bones Fantasy does this better).
The best use of the system to mind is the Cakebread and Walton “Clockwork” series. These delve into the “weird” side of Renaissance history, specifically the English Civil War complete with witches and clockwork horrors with optional Cthulhu just for fun. There is even a Pirate and Dragon option.
Nothing in these games is totally alien to the BRP line making it an option for ideas either way.
The OQ stream of games will be used for the Clockwork series only, something it does very well. I may incorporate ideas from other BRP/Cthulhu games, but likely they will be able to stand on their own feet.