Youlean Loudness Meter - Find your audio's true perceived loudness to prepare for TV and streaming services.

Serum - VST for FL Studio, Ableton Live, and many other VST supported DAWs. Heavily utilized in EDM.

AudioTool - Whether you want to make music for the club, or you're aiming to put a few tracks to a film, Audiotool is a website geared towards putting the mixes at your fingertips. Read more about AudioTool.

Surge XT - Open-source subtractive-hybrid synthesizer formerly sold commercially as Vember Audio Surge.

Sound Level Meter - You can measure the environmental noise in decibels.

Omnisphere - Piano, pad and synth VST for DAW's.