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• The Free Software Foundation (FSF) defines free software as a matter of liberty rather than price, a definition adopted from Richard Stallman's work.
• Richard Stallman, leader of the Free software movement and member of the Free Software Foundation, opposes applying the term 'open source' to what he refers to as 'free software,' considering the equation of the two terms incorrect and misleading.
• Richard Stallman believes the main difference between the terms 'open source' and 'free software' is that the choice of term signals the user's goals: development (open source) or a social stance (free software).
• Richard Stallman described the term 'free software' as 'free as in free speech, not free beer,' meaning the term refers to freedom rather than price.
• Sam William authored 'Free as in Freedom: Richard Stallman's Crusade for Free Software', published by O'Reilly Media in 2002.
• Richard Stallman maintains a preference for the original concept of free software because it takes a strong moral stance against proprietary software, despite the overlap between free software and open source in terms of software operation.
• Richard Stallman argues that the 'Open Source' movement misses the point of 'Free Software' in an essay published by the Free Software Foundation.
• Richard Stallman argues in his 2007 essay 'Why "Free Software" is better than "Open Source"' that the term 'Free Software' is philosophically superior to 'Open Source' because it emphasizes user freedom over development methodology.
• The term 'open source' was adopted in 1999 because many felt that Richard Stallman’s term 'free software' inaptly emphasized 'free of cost' as the principal value of the software.
• Richard Stallman stated on linuxtoday.com: "I see no social imperative for free hardware designs like the imperative for free software."
• In a 2015 article in Wired Magazine, Richard Stallman acknowledged the importance of free hardware but maintained that it lacks an ethical parallel with free software.
• In a 2015 Wired article, Richard Stallman adapted his viewpoint on open-source hardware, acknowledging its importance while maintaining that there is no ethical parallel between free software and free hardware.
• Richard Stallman launched the GNU Project in 1983 at MIT with the goal of developing a complete Free software operating system and restoring user freedom.