• GitHub repositories: math, puzzles
• Polar Curve Explorer (January 2020) [GitHub]
  — JavaScript/HTML for graphing spirals, roses, and related curves.
  — Also runs tangent line animations and morph animations.
  — Curve and animation parameters are configurable in the URL.
• Zoomable visualization of prime gaps (January 2020)
• Letter to Don Knuth (March 2018)
  — Toward the end of his 23rd annual Christmas lecture (December 7, 2017), Don Knuth presents a conjecture, sent to him by Bill Gosper. This is the HTML/MathML for a proof of the conjecture.
• Julia and Mandelbrot Set Explorer (February 2018)
  — JavaScript/HTML
  — Version 2 (February 2020) uses a Web Worker
  — Version 3 (February 2020) uses some WebAssembly
• Taricha (July 2016) [GitHub]
  — Python script that generates all possible arithmetic expressions in which each number from a list occurs exactly once.
  — Inspired by the puzzle "Using each of the numbers 1, 3, 4, and 6 exactly once, write an expression that evaluates to 24 using only addition, subtraction, multiplication, and/or division (and parentheses)."
• Quantum Computing Library for Python (February 2016) [Notes]
  — Python library for mathematically simulating the quantum circuit model of computation.
• Visualization of patterns in the number of Goldbach partitions (February 2020) [GitHub]