Basic Design

I've bought and examined many different game systems and compiled them into one composite for Esaene (E2E).

Here's the current copyright notice that I'm including in the OGL statement:
Open Game License v 1.0a Copyright 2000, Wizards of the Coast, Inc.
System Reference Document Copyright 2000–2003, Wizards of the Coast, Inc.; Authors Jonathan Tweet, Monte Cook, Skip Williams, Rich baker, Andy Collins, David Noonan, Rich Redman, Bruce R. Cordell, based on original material by E. Gary Gygax and Dave Arneson.
Modern System Reference Document, Copyright 2002–2004, Wizards of the Coast, Inc.; Authors Bill Slavicsek, Jeff Grubb, Rich Redman, Charles Ryan, Eric Cagle, David Noonan, Stan!, Christopher Perkins, Rodney Thompson, and JD Wiker, based on material by Jonathan Tweet, Monte Cook, Skip Williams, Richard Baker, Peter Adkison, Bruce R. Cordell, John Tynes, Andy Collins, and JD Wiker.
Elements of Magic: Mythic Earth, Copyright 2005, EN Publishing
Elements of Magic: Lyceian Arcana, Copyright 2004, EN Publishing
Elements of Magic, Revised Edition, Copyright 2004, EN Publishing
Monte Cook’s Arcana Unearthed, Copyright 2003, Monte J. Cook
A Game of Thrones RPG, Copyright 2005, Guardians Of Order, Inc.
Spycraft, Copyright 2002, Alderac Entertainment Group
Mutants & Masterminds, Second Edition, Copyright 2005, Green Ronin Publishing; Author Steve Kenson
A Magical Medieval Society: Western Europe, Copyright 2003, Expeditious Retreat Press; authors Suzi Yee and Joseph Browning.

I may include more as I write more. Basically, I'm taking a lot of the character creation and combat mechanics from AGOT and AU, using EOM as the core for magic (with some AU concepts), taking a lot of mechanics from Spycraft and M&M and using the Expeditious Retreat stuff as a good level set for economics and content structure - like designing cities, etc.

I've written a lot and it's currently undergoing many revisions, rewrites, and general error proofing.