Ardour
Ardour focuses on recording, composition, and mixing workflows.
What it does
Ardour handles recording, arrangement, and mixing in one workspace.
When to use it
For a band rehearsal, mark song sections before balancing the recorded tracks.
Visit Ardour official site
Amped Studio
Amped Studio focuses on browser-based recording and multitrack production.
Audacity
Audacity focuses on waveform editing, recording, and audio effects.
Audiotool
Audiotool focuses on browser-based instruments and audio effects.