Xpra is an open-source multi-platform persistent remote display server and client for forwarding applications and desktop screens.
It gives you remote access to individual applications or full desktops.
On X11, it is also known as screen for X11: it allows you to run programs, usually on a remote host, direct their display to your local machine, and then to disconnect from these programs and reconnect from the same or another machine, without losing any state.
It can also be used to forward full desktops, from X11 servers, MS Windows, or Mac OS X.

Xpra also allows forwarding of sound, clipboard and printing services.
Sessions can be accessed over SSH, or password protected over plain TCP sockets with or without SSL.
Xpra is usable over reasonably slow links and does its best to adapt to changing network bandwidth constraints.

Blog describing many cases where algorithms with quadratic complexity appear, almost always unintentionally.

Just what it says. Can use Dropbox, Google Drive or WebDAV as back-end storage.
See also https://organice.200ok.ch/documentation.html and the short review https://colekillian.com/posts/comparing-organice-and-orzly/
As of 2022-06-01, it offers sign-in with GitLab, WebDav, DropBox and GoogleDrive on https://organice.200ok.ch/sign_in, or once signed in on https://organice.200ok.ch/files
Perhaps I shall try the GitLab option before WebDav via NextCloud?
The link bin/compile\and\upload.sh on https://organice.200ok.ch/documentation.html#org48615b6 is not formatted correctly: the URL has underscores which are shown as \subscripts.

clockspeed uses a hardware tick counter to compensate for a persistently fast or slow system clock. Given a few time measurements from a reliable source, it computes and then eliminates the clock skew.

sntpclock checks another system's NTP clock, and prints the results in a format suitable for input to clockspeed. sntpclock is the simplest available NTP/SNTP client.

taiclock and taiclockd form an even simpler alternative to SNTP. They are suitable for precise time synchronization over a local area network, without the hassles and potential security problems of an NTP server.

HelenOS is a portable microkernel-based multiserver operating system designed and implemented from scratch. It decomposes key operating system functionality such as file systems, networking, device drivers and graphical user interface into a collection of fine-grained user space components that interact with each other via message passing. A failure or crash of one component does not directly harm others. HelenOS is therefore flexible, modular, extensible, fault tolerant and easy to understand.

See also https://www.wisdomandwonder.com/emacs/11659/blogging-with-emacs%f0%9f%90%83-from-org2blog%f0%9f%a6%84-to-wordpress
for a description of org2blog.

An open source Global Navigation Satellite Systems software-defined receiver.
Based on GNU radio.

Skyfield computes positions for the stars, planets, and satellites in orbit around the Earth. Its results should agree with the positions generated by the United States Naval Observatory and their Astronomical Almanac to within 0.0005 arcseconds (which equals half a “mas” or milliarcsecond).

   Written in pure Python and installs without any compilation.
   Supports Python 2.6–2.7 and Python 3.3–3.5.
   Has NumPy as its only binary dependency, the fundamental package for scientific computing with Python, whose vector operations make Skyfield efficient.

Collection of FFT and related algorithm implementation in various programming languages.

mpsh is an experimental command interpreter for Unix systems written by Dave Fischer at the Center for Computational Aesthetics and distributed under the 3-clause BSD license.