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.
|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|