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 - [![Open-Source Software][OSS Icon]](https://github.com/Soundnode/soundnode-app) [Soundnode](http://www.soundnodeapp.com/) - An opensource SoundCloud app for desktop.
 - [![Open-Source Software][OSS Icon]](https://github.com/devinhalladay/spotio) [Spotio](https://github.com/devinhalladay/spotio) - A Rdio-inspired light theme for the Spotify desktop app.
 - [![Open-Source Software][OSS Icon]](https://github.com/VCVRack/Rack) [VCV Rack](https://vcvrack.com/) - An open-source virtual modular synthesizer.
+- [![Open-Source Software][OSS Icon]](https://github.com/Audio4Linux/Viper4Linux-GUI) [Viper4Linux](https://github.com/Audio4Linux/Viper4Linux-GUI) - An audio effect processor based on Viper4Android
 - [![Open-Source Software][OSS Icon]](https://github.com/needle-and-thread/vocal) [Vocal](https://vocalproject.net/) - Podcast client for the modern desktop.
 - [![Open-Source Software][OSS Icon]](https://github.com/yktoo/indicator-sound-switcher) [Yktoo Sound Switcher Indicator](https://yktoo.com/en/software/indicator-sound-switcher) - Sound input/output selector indicator for Ubuntu/Unity.