- A program for backing up my Master of Orion Save Files
- A program for finding the best planet in Master of Orion
- A program for calculating my walking pace from time and milage
- Many simulations for various games
- Several Markov Decision Tree solvers (fairly simple dynamic programming)
- Many game strategy solvers
- Programs that process my life documentation notes - miles of jogging/walking per month, energy level, wake up time, productivity
- Many programs for testing mathematical theories or other math research for fun
- Physics or Astro-physics simulations
- Investment simulations
- CPU Benchmarking programs
- Programs for drawing graphics - spirals, mathematical objects, ...
- Lots of programs for Project Euler or LeetCode - just for fun.
(I probably write around 100 small programs a year for myself, mostly for fun.)