The best open source alternative to Audacity is Tenacity. If that doesn't suit you, our users have ranked more than 100 alternatives to Audacity and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Audacity are DarkAudacity, Kwave, Wavacity and Sneedacity.
Tenacity is an easy-to-use, privacy-friendly, FLOSS, cross-platform multi-track audio editor/recorder for Windows, macOS, Linux and other operating systems.
It is audacity without the bad stuff
it has pretty much same plugins and othe functionality plus some more - details on Tenacity homepage https://tenacityaudio.org/
DarkAudacity is a build/fork of the the well known free sound editor, Audacity, customized with a darker, more modern theme - and a few small tweaks. The audio engine underneath is the same audio engine. The same code powers it. Like Audacity, it is completely free.
As a fork of the original Audacity, DarkAudacity can read mogg MultiTrack files too
Kwave is a sound editor that can record to, play, open, and edit many file formats. Kwave makes it simple to edit audio in many ways.
It's extremely limited in functionality
Wavacity is derived from the open source Audacity and modified to run in the web browser.
Sneedacity (named after Sneed's Feed and Seed from The Simpsons episode, "E-I-E-I-D'oh") is a free (libre), open source, and privacy-respecting audio recording and editing suite forked from Audacity.
Another dead fork of Audacity.
Audio recorder with custom recording folder, nice recording volume indicator, recording notification, recording lock screen activity.
AudioMass lets you record, or use your existing audio tracks, and modify them by trimming, cutting, pasting or applying a plethora of effects, from compression and paragraphic equalizers to reverb, delay and distortion fx.
"The free and open source audio editor" is an easy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems. It is a fork of Audacity that respects your privacy and the GNU License.
WaveShop is a free, open-source audio editor for Windows XP/Vista/7. WaveShop is fast, lightweight, and bit-perfect, meaning samples aren't altered unless they need to be. Editing a portion of an audio file only affects that portion; the rest of the file is untouched.
Ecasound is a software package designed for multitrack audio processing. It can be used for simple tasks like audio playback, recording and format conversions, as well as for multitrack effect processing, mixing, recording and signal recycling.
Vocalis provides a simple and modern interface that provides a straight-forward way to record and play audio. It allows you to do basic editing, and create voice memos.
It's a memo recorder, not an audio editor.
DarkWave Studio is a free, open source, Digital Audio Workstation for Windows. Featuring a modular Virtual Studio, Pattern Editor, Sequence Editor and Multitrack Hard Disk Recorder. It has support for VST/VSTi instrument and effect plugins.
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It's a fork of Audacity started when they added some questionable privacy policy changes.