Most direct question I can ask.
Timbrica already has 380+ tools — audio, video, image, tests, accessibility, electronics, games, utilities. But everyone has that one case where they searched for an hour and couldn't find a clean, free, browser-based version of something simple.
Describe what you needed. One paragraph is fine. I personally read this thread and some of these turn into real tools — no guarantees on which, but a few definitely will.
No format restrictions, only constraint: it should run in a browser and be useful to more than one person.