emacs-ng is based off of the master branch of emacs, and regularly merges in the latest changes(this branch includes the native compilation feature from Andrea Corallo).

This project should be considered an additive native layer over emacs, bringing features like Deno's Javascript and Async I/O environment, Mozilla's Webrender, and other features in development. emacs-ng's approach is to utilize multiple new development approaches and tools to bring Emacs to the next level. It is maintained by a team that loves Emacs and everything it stands for - being totally introspectable, with a fully customizable and free development environment. We want Emacs to be a editor 40+ years from now that has the flexibility and design to keep up with progressive technology.

License is vague:
MINCE (version 2.5, 2.6, and 2.63), DIFF (version 1.1), Scribble (version 1.3), Pencil (version 1.3), and Crayon (version 1.3), along with any associated documentation (the "Materials"), are Copyright © 1980—1985 by Mark of the Unicorn, Inc.

These Materials are provided in accordance with Title 17 U.S.C. Section 107, and distributed without profit, in original and unmodified form, for non-commercial research and educational purposes, for use by those who have expressed a prior general interest in receiving the Materials.

The Portable MINCE authors claim no affiliation, endorsement, or sponsorship whatsoever by the originators of the Materials.

If you wish to use these copyrighted Materials for any purposes beyond "fair use", you MUST locate and obtain permission from the current copyright owner.

Another blog using org-mode. Recommends https://ambrevar.xyz/blog-architecture/index.html but that produces a 404 error as of 2023-05-12.

QMK (Quantum Mechanical Keyboard) is an open source community centered around developing computer input devices. The community encompasses all sorts of input devices, such as keyboards, mice, and MIDI devices. A core group of collaborators maintains QMK Firmware, QMK Configurator, QMK Toolbox, qmk.fm, and this documentation with the help of community members like you.
See also https://github.com/mihaiolteanu/mugur, an Emacs program to help configuring a QMK keyboard.

The site uses weblorg.
Other articles such as
https://muto.ca/posts/clean-password-management.html
https://muto.ca/posts/painting-in-guile-with-opengl.html
are interesting too.

Nyxt is a keyboard-oriented, infinitely extensible web browser designed for power users. Conceptually inspired by Emacs and Vim, it has familiar key-bindings (Emacs, vi, CUA), and is fully configurable in Lisp.
Was called Next before 2020-06-23 https://github.com/nEXT-Browser/nEXT

Successor of Dave Love's http://www.loveshack.ukfsn.org/emacs/multi-mode.el, found via
https://github.com/jingtaozf/literate-lisp

Work in progress.