Sam Williams, Free as in Freedom (2002) — Appendix A: Terminology (2002)
“ A similar situation surrounds the terms "free software" and "open source." Again, I have opted for the more politically laden "free software" term when describing software programs that come with freely copyable and freely modifiable source code. Although more popular, I have chosen to use the term "open source" only when referring to groups and businesses that have championed its usage. But for a few instances, the terms are completely interchangeable, and in making this decision I have followed the advice of Christine Peterson, the person generally credited with coining the term. ”
