The sites in the picture

A code editor written in Rust, built around fast rendering and several people editing the same file at once.

A JavaScript library for creative coding, with a browser editor and tutorials aimed at artists and beginners.

An ad-free, non-profit discussion site organised into groups and funded by donations.

An archive of typography in the wild, indexed by typeface, designer, industry and period.

A JavaScript library for 3D graphics in the browser, documented through several hundred runnable examples.

A chess server that is free of charge and free of advertising, entirely open source and run by a non-profit.

A hub collecting interactive essays and playable posts that teach a subject by letting the reader change its parameters.

A fork of Vim rebuilt around an extension API, with Lua scripting and built-in language server support.

Programming explainers and hand-drawn zines on debugging, networking, Git and how computers actually work.

A notes application that works directly on a folder of local Markdown files, with backlinks and a plugin ecosystem.

A self-contained SQL database engine that runs inside the application rather than beside it. Public domain, with unusually thorough documentation.

A browser whiteboard for diagrams that come out looking hand-drawn, with local storage and no account required.

A CSS framework of single-purpose utility classes, applied in the markup rather than in a separate stylesheet.

An application hosting platform that runs containers in regions close to the people using them.

A platform for collecting and connecting images, links and text into shared research channels, with no ads and no algorithmic feed.

A small library that lets HTML attributes perform AJAX requests, CSS transitions and WebSocket calls without written JavaScript.

Essays on software performance, hardware reliability and the economics of engineering work, usually with the measurements included.

Bret Victor's essays, talks and prototypes on designing tools that let people see what they are making.

Mathematics explained through intuition and analogy first, with the formulas arriving afterwards.

Illustrated essays and a digital garden on programming, anthropology and how ideas develop over time.

Long-form explanations of physical and mechanical subjects, each built around interactive diagrams the reader can drag.

A computing-focused link aggregation community, invite-only, organised by tags rather than by separate forums.

An infinite-canvas drawing tool, also published as a React component for embedding in other applications.

A marketplace for independent games where creators set their own price, and the host of a great many game jams.