Two tools, both free, both running entirely in your browser.
I write software for a living and most of it belongs to clients. These two are mine, so they are the ones I can show you. Both are small on purpose, both are on GitHub, and both are built the way I would build the same thing inside a company — the constraints are just visible from the outside for once.
Each project has two pages. The tool itself runs on GitHub Pages; the page here is the engineering account of it — what the constraint was, what it cost, and where the approach stops working.
A file viewer that never uploads your files.
Markdown, YAML, CSV, STL, 3MF, STEP, OpenSCAD and images, opened directly in the browser. No account, no upload, no server round trip — the file is read from disk by the page and processed on the device. Installs as a PWA and works offline afterwards.
Parametric geometry, recomputed in the browser on every slider move.
A single OpenSCAD model for vase-mode containers, with the same geometry maths reimplemented in JavaScript so the shape rebuilds in 10–50 ms while you drag a parameter. Exports STL for printing and faceted AP214 STEP for CAD.
Both are Apache-2.0. Both are maintained, not abandoned demos — the version numbers move. If you want to see how I think about a system before you hire me to look at yours, this is the cheapest way to find out.
