REAPER
REAPER focuses on flexible multitrack recording and editing.
What it does
REAPER records and edits audio in a customizable multitrack workspace.
When to use it
When cutting an interview, keep host and guest audio on separate tracks.
Visit REAPER official site
Amped Studio
Amped Studio focuses on browser-based recording and multitrack production.
Ardour
Ardour focuses on recording, composition, and mixing workflows.
Audacity
Audacity focuses on waveform editing, recording, and audio effects.