PC based Oscilloscope and Spectrum analyzer using sound card
Analyze audio files for Peak levels, peak and total RMS, and DC offset
display, record, add special effects
Strobe Tuner for Windows
piano like variable dynamic reverb
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