Local Apps
S.L.A - Flashcard and Quiz tool for language learning (Clojure using Swing)
wxMicroscope - wxPython gui for USB microscopes (e.g. Jiusion B06WD843ZM)
HSK-3.0 - wxPython GUI for HSK 3.0 characters and vocab practice
Games
PhraseWeaver - Love2D sentence translator game (German only currently)
CozySudoku - Love2D Sudoku game with nice colours and music
Extensions (Firefox)
Zhuyin - adds Zhuyin next to Traditional Chinese characters
Anki Add-ons
ExportWithAudio-Anki - Anki add-on for configurable TSV/CSV export of notes and audio