An ASCII video renderer.
Some lisp-like noodlings in JS, by someone who doesn't really know lisp.
A 3d audio visualizer.
Breadboards, integrated circuits, 50 odd meters of wire, etc.
A real-time regular expression editor.
3D software engine.
Conway's Game of Life
JS1K Lattice Boltzmann
Lattice Boltzmann, implemented in under 1K.
A computational fluid dynamics simulation.