Everything in the catalog

Web mind map editor with many layouts, themes and export options; interface is in Chinese.

Load CSV, GeoJSON or other geodata and explore it as layered maps with filters and time playback.

Playground for a plugin-based WYSIWYG Markdown editor, useful to test the editing experience before embedding.

Sends files and text between devices on the same network or via a room code, with no signup.

Demos of neural networks trained directly in JavaScript for classification, regression and more.

Browses JSON through a clean viewer with previews for values such as dates, colours and images.

Browser-based PDF toolbox for merging, splitting, compressing, converting and editing without server uploads.

Builds and tests JavaScript or PCRE regular expressions with live highlighting, contextual help and a searchable community library.

Peer-to-peer file transfer that gives you a link; the data goes straight from sender to receiver.

Demo of the UAParser.js library that detects browser, engine, OS, device and CPU from a user-agent string.

Design avatars with several illustrated styles and export SVG or PNG.

Resume builder and parser that works locally in the browser, no sign-up, exporting a PDF.

Draw BPMN 2.0 business process diagrams in the browser and export the XML.

Reports the install and bundle size cost of an npm package.

Edits OpenAPI definitions with live documentation preview and validation.

Converts between many code and data formats, such as JSON to TypeScript, SVG to JSX and CSS to JS.

Interactive diagram of a small convolutional network classifying images, running in the page.

Flowchart and diagram editor that saves to your device or cloud drive and exports PNG, SVG or PDF.

Paste or upload a table and map columns to many chart types to export vector graphics.

Reformats minified or messy JavaScript, HTML and CSS with indentation settings.

Creates a .gitignore file from templates for operating systems, IDEs and languages.

Tetris implemented with React, playable with keyboard and with a pause feature.

Cheat sheet of easing functions with previews and ready-to-use CSS values.

Demo page for the PathFinding.js library: pick an algorithm, place walls and animate the search.