Most of my app ideas haven't come to fruition yet, simply because I have so many of them relative to free time. I add the worthy ones to my ToDo list, to be rediscovered by Future Me when the time is right. Here are a few of the apps on my list:
Audio pulse simulation
Phasor analysis of Reimann-Zeta function.
Forces from inter-field operators.
Audio time-frequency grid.
Realtime audio spectrum.
Visualization of Bessel function integrand.
Image-to-gcode app for laser engraving.
3D model from laser line scan (I use a 3DP for this).
Random noise in a harmonic tree model
App for using a bare CCD as spectrometer.
OpticsLab, puzzle game involving aligning ultrafast spectroscopy experiments.
Repeated annihilation particle grids.
Coupling between longitudinal and transverse modes at an interface.
Particle combs: Forces in open vs closed scenario.
Generative music, dynamical sound filters, etc.
Can drafting accelerate the 2nd car? Wind tunnel.
2D DFT, DFT of tree shapes, etc.
Filament formation (lightning).
Excitons and charge pairs in a semiconductor.
Reverb simulation. Reverb removal via holographic reconstruction.
Convolving space with a simple machine.
A social network for sharing and mutating simulations.
A social network for training and competition of battle swarms.
Fermat's Last Theorem: Exploring solution space over exponent.
Generative version of networkresonator.php with inline LCR components.
Space-filling line integration as approximation of FT.
Random trees can be generated from white noise.
confinement.php on a sphere.
Mutual inductance of knotted coils.
Effective forces from teleparallelism.
Traffic simulation. Compression waves.
Ballistic simulations with billiards.
Whirligig model of charge repulsion.
Split-step FT supercontinuum calculation.
FROG trace from pulse.
Hydrodynamic zeeman effect.
Light-front picture of electron repulsion.
Spiral of multiples platform game.
Torque waves in 3D.
Harmonic coupling of planetary atmospheres.
Conversion of real numbers in an nD space to helicities.
Hyperrotation.
Fractal period contours in 3D. e.g. The metahelix.
2D FT of naive deBroglie representation of repelling electrons.
The 2-particle torus.
Rope aliasing.
Evolution of military hierarchy.
2e repulsion in eternalistic dephasing picture.
Fire simulator.
Phase accumulation from a passing wave.
Twisted reference frames for untwisting orbits.
Anharmonic oscillator circuits for music generation.
Visualization of the difference between f(g(x)) and g(f(x)).