Real-time microphone noise suppression on Linux.
NoiseTorch-ng is an easy to use open source application for Linux with PulseAudio or PipeWire. It creates a virtual microphone that suppresses noise, in any application. Use whichever conferencing or VOIP application you like and simply select the filtered Virtual Microphone as input to torch the sound of your mechanical keyboard, computer fans, trains and the likes.

A GUI frontend for @werman's Pulse Audio real-time noise suppression plugin.
Cadmus is a graphical application which allows you to remove background noise from audio in real-time in any communication app. Cadmus adds a notification icon to your shell which allows you to easily select a microphone as a source, and subsequently creates a PulseAudio output which removes all recorded background noise (typing, ambient noise, etc). If you find the application useful, leave a star — it helps!

After 3 years of research at the CNRS, the largest governmental research organisation in France, SERENITY is going to dramatically improve your everyday life by cancelling external noise passing through your windows.