The Free Standards Group was an industry non-profit consortium chartered to primarily specify and drive the adoption of open source standards, founded on May 8, 2000. All standards developed by the Free Standards Group (FSG) were released under open terms (the GNU Free Documentation License with no cover texts or invariant sections) and test suites, sample implementations and other software were released as free software. On January 22, 2007, the Free Standards Group and the Open Source Development Labs (OSDL) merged to form The Linux Foundation, narrowing their focus to promoting Linux in competition with Microsoft Windows.

Work groups

FSG was responsible for the following work groups, and transferred responsibility to The Linux Foundation:

Corporate members

Not-for-profit members

The Free Standards Group also had individual memberships; the board of directors was elected annually by all of the membership.