In his note, Stallman made clear the difference between Free and Open Source Software (FOSS) and open source as conceived by Eric Raymond and supporters in the business community. FOSS is not just "free as in free beer". Under FOSS software is free, not just for the user. The software itself has liberties.

The Australian Open Source community has called for the consideration of Free and Open Source Software (FOSS) in the implementation of the Rudd Government’s Digital Education Revolution Policy.

FOSS is an abbreviation for Free and Open Source Software. In other words, FOSS is software whose source code is openly available. People can install and even modify FOSS as they please, so long as they follow a few basic requirements listed in the license.

Open source software initially was a head-scratcher: “How can you make money selling something for free?” But once open source advocates clarified the meaning of free – “Free as in speech, not as in beer” – the open source economy took off.

RMS: «When we call software “free,” we mean that it respects the users' essential freedoms: the freedom to run it, to study and change it, and to redistribute copies with or without changes [...] As the advocates of open source draw new users into our community, we free software activists have to work even more to bring the issue of freedom to those new users' attention.

Hearing the terms "free software" or "open source," you might imagine that they referred to a single school of thought. Even "free and open source software" (FOSS) suggests only two different outlooks: Free software, which values political and philosophical freedom, and open source, whose main interest is enhanced software quality.

Pundits and business executives alike are predicting gloomy economic times for 2009. But when the talk turns to free and open source software (FOSS), suddenly the mood brightens.

“Open Source” advocate: «...I associate much more with the "Open Source" (also as Richard defines it) camp, and am open to the existence and use of proprietary software...» --

Free and open source software (FOSS) is well-known for promoting new development methods. Now, a European nonprofit organization known as FOSS Bridge hopes that FOSS can be equally innovative in promoting cooperation between companies and in fostering investment in developing nations.