A full and efficient ISO/IEC 13816:2007(E) ISLISP Implementation.
Commercial software, can be used for free for non-commercial use.
An emacs-like editor for DOS and Windows by the same author can be found on http://christian.jullien.free.fr/emacs/
Interim is an attempt to implement an operating system using ideas from the Lisp machines and Plan 9. https://github.com/mntmn/interim
The blog has other interesting articles on (Emacs) Lisp, Scheme, git...
Filestash (formerly nuage) is a web client for org-mode. It started as its author believe emacs and org-mode are the greatest thing since sliced bread. The project aims to fix the pain points org-mode's users may have:
- emacs isn't great out of the desktop world, it needs a cross platform companion app
- not everyone is willing to go through learning emacs which makes org-mode a hard to sell tool to manage team project.