Open source software is software whose source code is available for modification or enhancement by anyone.
http://opensource.com/resources/what-open-source
Free software developers guarantee (...) any user can study the source code, modify it, and share the program.
http://www.fsf.org/
The OSS community (...) welcomed the usability specialists like all those who were willing to contribute in some way.
Open Source and HCI Philosophies in Open Source Projects - Incompatible or Co-Existent?, M. Rajanen, N. Iivari, University of Oulu, Finland, 2013
The developers expressed that they would readily welcome any further usability help and especially (...) by having a usability specialist as a close-knit part of their team.
Open Source and HCI Philosophies in Open Source Projects - Incompatible or Co-Existent?, M. Rajanen, N. Iivari, University of Oulu, Finland, 2013
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