Awesome
Bitcoin Developer Reference
Introduction
The Bitcoin Developer Reference is designed to supply Bitcoin enthusiasts and developers with technical background on the inner workings of Bitcoin. Note that although it has been reviewed by several Bitcoin experts, it neither claims to be complete nor correct.
License
The Bitcoin Developer Reference is released under the terms of the CC BY-SA 4.0 license. See http://creativecommons.org/licenses/by-sa/4.0/ for more information.
Development process
Contributors work in their own trees and submit pull requests whenever the change is ready. The changes will be reviewed and if necessary discussed before being accepted.