Hy is a Lisp dialect that's embedded in Python.

Explanation of GNU epsilon https://www.gnu.org/software/epsilon/epsilon.html
"The ε core language, an imperative first-order language, is called ε₀. It’s inconvenient for humans to use for serious problems, yet simple and potentially very efficient. Using ε₀ I’ve built ε₁, a higher-level language with a Lispy feel, but untyped — not dynamically typed like Lisp: untyped, like Forth and machine language."

See also https://ageinghacker.net/blog/posts/33/ for make-gallery, a bash script to generate a HTML photo gallery.

Found via a comment about calc http://www.isthe.com/chongo/tech/comp/calc/index.html
on https://groups.google.com/g/comp.lang.tcl/c/7JXGt-Uxqag/m/rcHDLLu6MpEJ
See also https://www.systutorials.com/docs/linux/man/1-calc/ for a man page.

Document explaining the development of a bc/dc clone. Might be a good example to follow, if I ever make a public project.

"It is now barely capable of executing a few unmodified Windows exe files in a browser (see the site for some links)."
Contains links to information about various aspects of Windows and how emulators such as Wine are working.

Found via https://interlisp.org/doc/info/Using.html, which links to https://github.com/blakemcbride/medley-intro but has other interesting stuff such as
https://github.com/blakemcbride/Rand-E-Editor
https://github.com/blakemcbride/TECOC
https://github.com/blakemcbride/LISP9
https://github.com/blakemcbride/Lisp1

A new cross-platform browser project, from the author of SerenityOS https://serenityos.org/
Found in c't.

Found via the author's blog https://www.dl1ye.com/posts/2021-04-29-universal-lnb-biastee/ which in turn was found when searching for a bias tee.

We currently support the processing of:

the United States' Global Positioning System (GPS);
the Russian GLONASS system (GLONASS);
the European Union's Galileo system (Galileo);
the Chinese Navigation Satellite System (BeiDou);
the Japanese QZSS develop system (QZSS).
We are actively developing Ginan to have the following capabilities and features:

Precise Orbit & Clock determination of GNSS satellites (GNSS POD);
Precise Point Positioning (PPP) of GNSS stations in network and individual mode;
Real-Time corrections for PPP users;
Analyse full, single and multi-frequency, multi-GNSS data;
Delivering atmospheric products such as ionosphere and troposphere models;
Servicing a wide range of users and receiver types;
Delivering outputs usable and accessible by non-experts;
Providing both a real-time and off-line processing capability;
Delivering both position and integrity information;
Routinely produce IGS final, rapid, ultra-rapid and real-time (RT) products;
Model Ocean Tide Loading (OTL) displacements.
The software consists of two main components: Network Parameter Estimation Algorithm (PEA) and Precise Orbit Determination (POD).

See https://spec.commonmark.org/ for the specification, http://code.commonmark.org/ for a reference implementation and validation test suite on GitHub.