Plask is a bathtub game for your Apple Watch, which sounds like nothing until you remember the Ultra has a real dive computer in it that almost no owner has ever used. Pixel-art ducks swim on your wrist and go under when you go under, on the actual depth reading, alongside sharks, Loch Ness and fermented Swedish herring. Danni Efraim invented a Royal Swedish Bath Authority to issue 42 certificates for your bathing career, and the duck gets a hat if you collect enough.

OpenLogi is an open-source replacement for Logitech's Options+ that talks to the mouse directly over HID++, so remapping a button doesn't involve an account or a background service. Xuan Zhang wrote it in Rust after installing Options+ to change one thumb button and finding it wanted a login and a few hundred megabytes. Your settings live in a config.toml you can read and copy between machines. Per-app profiles and Flow aren't in it yet.

KanaSensei drills hiragana and katakana, the roughly 200 characters that get you reading a menu or a train platform. Each character comes with a picture-story mnemonic and you type the reading back. Samuel built it after arriving in Japan with the trip planned to the hour and finding the signs, the menus and the konbini shelves were all just squiggles to him. He says two weeks does it, and there's a streak to keep you turning up.