Free, open-source metering plugin for mixing and mastering: LUFS loudness (EBU R 128), true peak, spectrum, spectrogram and goniometer in one window. VST3 / AU / CLAP.
OpenDaw — a free, open-source Digital Audio Workstation for Windows. Qt 6 UI, Tracktion Engine audio, MIDI piano roll, VST3 instruments, built-in effects, Claude AI assistant.