This document outlines 7 secrets of successful open source developers: 1) having a passion for open source work, 2) focusing one's efforts, 3) persisting through challenges, 4) achieving mastery in their field, 5) finding motivation, 6) collaborating with other people, and 7) having some luck when opportunities arise. The document was written by Dimitris Andreadis to share insights on qualities that help open source developers succeed.