PC based Oscilloscope and Spectrum analyzer using sound card
Analyze audio files for Peak levels, peak and total RMS, and DC offset
Fast, bit-perfect audio editor that doesn't modify samples needlessly
Feel the music
Thérémine generates high quality audio from an USB Arduino Theremin
The real open-source RTL-SDR 2832 dongle panoramic spectrum analyzer
Virtual Sound Level Meter for analyzing calibrated sound files
Tests dynamic range of mp3 files
Zwicker's Loudness Calculation (ISO532B) Tools