Miscellaneous HTML+JavaScript tools built mostly with the help of LLMs. See also /python/ for tools written using Python.

This collection is an experiment in prompt-driven development with very low stakes.

The colophon lists commit messages and transcripts for every tool.

The code lives in simonw/tools and many tools used the Claude custom instructions described here.

All-in-one online, free, browser-based toolkit for geographic data analysis. It offers: - Interactive Map Tools: Measure distances and areas directly on the map. - Data Format Converters: Convert between TopoJSON and GeoJSON formats seamlessly. - Coordinate Utilities: Perform conversions and other coordinate-based operations.

No sign-up required, and all tools run client-side for privacy and speed.

Built with open standards and designed for developers, educators, and anyone interested in geographic data.

Free utility tools for developers, designers and content creators. Resize images, trim audio, count words, calculate dates — all with fast, simple interfaces.

FreeTinyTools Is an online web tools service with large collection of image tools,text tools, website management tools and Development tools

FreeTinyTools Is an online web tools service with large collection of image tools,text tools, website management tools and Development tools

Shiori is a Pinboard and Delicious OS X client that allows you to find and add bookmarks.

A tiny mac app to add bookmarks to Pinboard.