Free and Open Source Software, also F/OSS or FOSS, is software which is liberally licensed to grant the right of users to study, change, and improve its design through the availability of its source code. F/OSS is generally synonymous with free software and open source software, and describes the same licenses, culture, and development models.

=Licenses=

The most well known and popular F/OSS licenses include: Apache License, BSD license, GNU General Public License (GPL), GNU Lesser General Public License (LGPL), MIT License and Mozilla Public License.

There are a number of endorsed F/OSS definitions, and related lists of licenses. The above licenses are approved by all definitions.

F/OSS definitions and guidelines:

Lists of licenses:

=Culture=

The Open source culture and Open source community stem from hacker culture.

=Terminology=

FOSS or F/OSS is an acronym for free software and open source software that is most often used in English-speaking military software communities.

The term FOSS was first used by )

=See also=