Audio & Music
Acoustics, tone, and signal tools that listen and measure.
Tuning and Temperament Explorer Twelve notes that almost fit, and how we fudge them. 
Chladni Plate Patterns Sand runs to where the plate stands still. 
Drum Pattern Sequencer Sixteen steps, a kick and a snare, and it grooves. 
Metronome Steady time, down to the sample. 
Tuner and Reference Tones Hear the note, or let it hear you. 
Wind Chime Tube Calculator Cut to length, hung at the node, tuned to a scale. 
Virtual Piano Play, see the notes, keep the take. 
Standing Wave Explorer Every harmonic, seen and heard. 
Microphone Oscilloscope See the sound your microphone hears, wave by wave. 
Tone Generator Any frequency, any shape, clean enough to measure with. 
Fret Position Calculator Every fret, to the hundredth, for any scale. 
LUFS Loudness Meter Know your loudness before the platform changes it. 
Speaker Box Designer From driver numbers to a box you can build. 
DTMF Decoder Hear the tones. Read the number. 
Room Mode Calculator See the bass your room adds on its own.