A web-based "note taking app with weird functionality I want, with a bit of an Acme feel" is the latest one (README severely outdated, but I post screenshots and screen captures of new features in Twitter to leave myself a track record to update it) https://github.com/rberenguel/weave
Somewhat earlier, expiring tabs for Chrome https://github.com/rberenguel/bestBefore
Most of my projects are in one way or another scratching my own itches.