There is an ancient tradition of people trying to do the their own Fantasy Roleplaying Games. For much of the early years of our hobby this consisted of people trying to do D&D "right" or more even "realistically." Examples of this particular design path include games like: Runequest, Chivalry & Sorcery, Harnmaster, Palladium Fantasy (1st Edition), Rolemaster, Warhammer Fantasy Roleplay, and many others. Even my beloved AD&D 1st Edition can be seen as an outgrowth of this impulse in response to the original 1974 D&D Boxed set. I've always been attracted to these more complex games, and the idea of simulating in great detail my own fantasy characters and the kingdom they live in has always been a powerful draw for me.
To that end, I've started tinkering with my own game system that definitely draws inspiration from these types of games. Right now it consistes of a mass of notes in a notebook, but it's edging up on eight or nine pages of rough notes right now. I've no intention of publishing this for sale, but maybe I'll make it available as a free pdf eventually, and I don't really know where this is going though. Conceivable, I could wake up tomorrow and decide this is a terrible idea.
Right now I'm excited about though. I'll post more about it if I continue to make progress.
Old school simulationists unite!