Audacity
The world's most popular open-source tool for recording, editing, and enhancing audio tracks. Supports plugins, multi-track editing, and cross-platform use.
Audacity is an open-source alternative to:

Audacity is a free, open-source audio editor and recorder available for Windows, macOS, and Linux. It provides advanced tools for recording, editing, and enhancing audio tracks, making it ideal for podcasters, musicians, and audio enthusiasts.
Key Features
- Cross-platform support: Works on Windows, macOS, and Linux
- Multi-track editing: Edit and mix multiple audio tracks simultaneously
- Plugin ecosystem: Supports VST3 and Nyquist plugins for extended functionality
- Audio format support: Import, export, and convert between WAV, MP3, FLAC, Ogg, and more
- Advanced editing tools: Noise reduction, audio cleanup, and voice enhancement features
- Real-time effects: Apply effects like reverb, echo, and pitch correction during playback
- Scripting support: Automate tasks with Nyquist scripting
- Cloud integration: Sync projects with Audio.com for collaboration and backups
Tech / Self-Hosting
Audacity is open-source software that can be self-hosted by downloading the source code from its GitHub repository. It does not require a server for local use but can be integrated with cloud services like Audio.com for project management and collaboration.