What can you build with one HTML file and an LLM? A lot more than you think. This post shows hard-won patterns from 150+ real tools, showing how to skip frameworks, exploit browser primitives, and build projects fast with copy/pasteable code.

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.

See My Repo is a simple online tool that generates an aesthetically pleasing and easy-to-read preview page for any GitHub repository by analyzing its content and metadata.

List of open source low-code tools in GitHub. The oss-lowcode-tools GitHub repository is an awesome list that curates and categorizes various open-source low-code and no-code tools for building applications and workflows.

macOS ISOs. Includes torrent download links and MD5 hashes. Created using MIST or by manually converting. The macOS-ISOs GitHub repository provides scripts and tools designed to download macOS installers and convert them into ISO files, primarily for use within virtual machine environments.

README.so is a simple online editor that helps developers quickly create and customize professional README files for their projects using a user-friendly interface.

Themer is a free and open-source online tool that generates synchronized color themes for over 30 different development environments, including code editors, terminals, and even wallpapers, based on a single selected color palette.