CodeMirror
codemirror.net
Extensible code editor component for the browser, rewritten as modular CodeMirror 6 in 2022.
Semantic rich-text editor library released in 2026, built on lessons from ProseMirror.
Visit Wordgard ↗Semantic rich-text editor library released in 2026, built on lessons from ProseMirror. Wordgard is a developer tools product built by indie maker Marijn Haverbeke, launched in 2026.
codemirror.net
Extensible code editor component for the browser, rewritten as modular CodeMirror 6 in 2022.
prosemirror.net
Toolkit for building schema-based rich-text editors on the web, with collaborative editing support.
eloquentjavascript.net
Free online JavaScript textbook, published in print by No Starch Press and now in its fourth edition.
github.com
Small, fast JavaScript parser written in JavaScript and used across the build-tool ecosystem.
lezer.codemirror.net
Incremental LR parser system that powers syntax highlighting and analysis in CodeMirror 6.
Crowdfunded JavaScript code-analysis engine that provided editor autocompletion and type inference.
Wordgard is a developer tools product: Semantic rich-text editor library released in 2026, built on lessons from ProseMirror.
Wordgard was made by Marijn Haverbeke, Creator of CodeMirror, ProseMirror and Acorn; author of Eloquent JavaScript. It launched in 2026. Marijn Haverbeke has also built CodeMirror, ProseMirror, Eloquent JavaScript, Acorn.
Yes. As far as IndieMakerList knows, Wordgard is still active and run by Marijn Haverbeke at wordgard.net.
marsx.dev
SaaS builder that unites no-code, pro-code, AI and micro apps.
messwithdns.net
Interactive playground for experimenting with real DNS records.
memory-spy.wizardzines.com
Tool for running programs and inspecting their memory.
nginx-playground.wizardzines.com
Test nginx configurations instantly in the browser.
integer.exposed
Visual explorer for how computers represent integers.
sizzy.co
Browser for web developers with synchronized devices, project workspaces, isolated sessions, debugging and coding agents.