Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Wavacity Audio Editor
Wavacity Audio Editor is a free opensource audio editor for the web.
JackAudio
JackAudio take2 the audio output of one piece of software and send it to another.
SpeechLogger
SpeechLogger is a great online voice to text tool.
ffmpeg
Cinder
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puddletag (simple, powerful audio tag editor)
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beets (command line tool for managing music tagger and library)
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clementine (a modern music player)
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cmus (a very cool Command-line MUSic player)
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mutagen (a python library for handling audio meta data)
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festival (sound synthesis)
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Ardour (audio editing)
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Audacity (audo recording, editing)