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.

Andy Updegrove writes an article providing an overview of the history of FOSS and its champions, the major philosophical differences that divide FOSS from OSS developers, the multiple licenses under which FOSS is made available, and the principle non-profit institutions that support and promote FOSS.

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.

While recent Ubuntu releases have been more about careful enhancement and distribution maintenance, the current version 9.10 offers a new look as well as a whole range of new technical features – the developers have restructured the distribution's standard filesystem, boot system and hardware maintenance, and they have introduced new software.

This opinion piece (PDF) in Notices of the American Mathematical Society, argues that since mathematicians increasingly rely on software in generating their results, we should be increasingly concerned about the use of proprietary math software, since (a) not everyone has access to that software and (b) the code used by that software is usually closed-source, so the algorithms used can’t general

The Workshop on the Future of Research on Free/Open Source Software (FOSS) was recently held in Newport Beach, California. FOSS 2010 was an invitation-only workshop aimed at identifying the key research projects and challenges for free and open source software.

Some of the best software available is open source, but non-proprietary software has enemies as well as friends. Not surprisingly, then there's been plenty of fog on Capitol Hill about free and open source software (FOSS) for a decade now.

Traditionally, any mention of marketing has the average member of the free and open source software (FOSS) community reaching for the garlic and crucifixes. Yet, despite the baying of mobs with pitch forks and torches in the background, the topic of how FOSS presents itself to the world at large has started to be raised in blogs.

Traditional corporate policies for managing software assets are often inadequate to address the unique characteristics of free and open source software, according to HP officials. During a recent customer engagement, for example, HP discovered three times as many FOSS licenses as the client originally thought it held, totaling 75 versus 25.