Featured

A website inspired by the Borges story that contains every possible page of 3,200 characters, which you can search to find any text you can think of.

libraryofbabel.info

A magazine about the past and the future of low-technology solutions, run on a website that is itself powered by solar energy.

solar.lowtechmagazine.com

Animated, step-by-step visualisations of data structures and algorithms, from sorting and linked lists to graphs and dynamic programming, with the ability to run each on your own input.

visualgo.net

A free web tool that compresses PNG, JPEG and WebP images using smart lossy compression, usually shrinking files a great deal with little visible change.

tinypng.com

A free, open-source diagramming tool for flowcharts, UML, network and org charts, which saves to your device, Google Drive, GitHub and more. Formerly known as draw.io.

app.diagrams.net

A Google tool for training your own image, sound or pose recognition model in the browser using your webcam or microphone, with no coding required.

teachablemachine.withgoogle.com

A browser-based neural network visualiser: choose a dataset, add layers and neurons, then watch the network learn in real time.

playground.tensorflow.org

A huge library of user-made trivia quizzes and games, many of them timed, on every topic from geography and history to pop culture.

sporcle.com

Short browser tests for reaction time, memory, typing speed, aim and more, showing how you compare with other people's results.

humanbenchmark.com

An animated weather map showing wind, rain, waves, temperature and more, with the option to compare forecast models such as ECMWF and GFS.

windy.com

A community platform for recording and identifying plants, animals and fungi, where photos are reviewed by other naturalists and feed into open biodiversity data.

inaturalist.org

The Rijksmuseum's online collection of Dutch art and history, including works by Rembrandt and Vermeer, with high-resolution images of public-domain pieces.

rijksmuseum.nl/en/collection

A very large online collection of historical maps, many georeferenced so you can overlay them on a modern map of the same place.

davidrumsey.com

Scans a website's HTTP security headers, such as CSP, HSTS and cookie flags, then grades the result and explains how to fix each issue.

developer.mozilla.org/en-US/observatory

A collection of concise, well-organised cheatsheets for languages, tools and frameworks, from Bash and Git to CSS, React and SQL.

devhints.io

A large collection of game assets in 2D sprites, 3D models, UI packs and audio, released under CC0 so they can be used for any project.

kenney.nl

A large library of free CC0 PBR textures, HDRI lighting maps and 3D models for use in games, animation and visualisation.

ambientcg.com

Marijn Haverbeke's free book on JavaScript and programming, readable online with a built-in code sandbox so you can run and edit every example on the page.

eloquentjavascript.net