Software
Apps I have built on my own and put online.

Pyramid Mental Arithmetic (iOS)
An iOS app for solving number pyramids (also called math pyramids or calculation pyramids) in your head: add the neighbouring numbers upward and fill in the blanks. Working-memory training you can do anywhere.
iOS AppTrainingMental Math

Pyramid Mental Arithmetic (Web)
The browser version of the number pyramid (calculation pyramid) mental arithmetic trainer for working memory.
Web AppTraining

Music Notes
A web application for music sight-reading training.
Web AppMusic

Perfect Pitch
A web application for perfect pitch training.
Web AppMusic

Shiritori Training
A web application for people who want to become the ultimate Shiritori Master.
Web AppGame

Aurum
A cross-platform terminal emulator built with Go and Wails, featuring a golden theme and multi-tab support for macOS and Windows.
Desktop AppGoWailsxterm.js