Nightingale is a free, open source audio player and web browser based on the Songbird media player source code. As such, Nightingale's engine is based on the Mozilla XULRunner with libraries such as the GStreamer media framework and libtag providing media tagging and playback support, amongst others. Since official support for Linux was dropped by Songbird in April 2010, Linux-using members of the Songbird community diverged and created the project. By contrast to Songbird, which is primarily licensed under the GPLv2 but includes artwork that is not freely distributable, Nightingale is free software, licensed under the GPLv2, with portions under the MPL and BSD licenses.