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This is a list of notable software packages which were published as free and open-source software, or into the public domain, but were proprietized, such that later versions were only released under a proprietary software license.

List of formerly open-source software
Title	Original release	Relicensed release	Initial free license	Notes
Boot to Gecko/Firefox OS, proprietized as KaiOS	2013	2017	MPL	Still uses GPL Linux kernel, but otherwise proprietary
FBReader	2013	2015	GPL	Apparently the number of devs was limited, and they all agreed to relicense it.
Tux Racer	2000	2002	GPL	Forked into Extreme Tux Racer (formerly PlanetPenguin Racer)
Nexuiz	2005	2012	GPL	As Nexuiz (2012 video game). Original forked into Xonotic

Types and standards	Comparison of licenses Contributor License Agreement Copyleft Debian Free Software Guidelines Definition of Free Cultural Works Free license The Free Software Definition The Open Source Definition Open-source license Permissive software license Public domain Viral license

Challenges

See also