Rockbox
Software
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Rockbox is a free and open-source software replacement for the OEM firmware in various forms of digital audio players with an original kernel. Wikipedia
Initial release date: June 2, 2002
License: GNU General Public License
Programming languages: C and Assembly language
Default user interface: GUI
Latest preview: Daily
Latest release: 3.15 / November 15, 2019; 4 years ago
Platforms: Digital audio players, various