SDR Makerspace is an initiative of the European Space Agency and Libre Space Foundation bringing together makers, open-source hackers, radio amateurs, researchers, from all over Greece and provide funding, resources, and a passionate community tackling together challenges in using Software Defined Radio for space communications, opening up space communications development to a wide variety of people, organizations and companies.

HP-15C Simulator for Windows, Linux and macOS. Supports data exchange with SwissMicros https://www.swissmicros.com DM15 models.

Source Code for MATLAB (1982-05-25)
A matrix computation System.

Written in FORTRAN by:

Cleve Moler
Department of Computer Science
University of New Mexico
Albuquerque, NM  87131

Source code distributed by:

Jim Kweeder
Department of Chemical Engineering
Clarkson University
Potsdam, NY  13676
Internet:  kweeder@sun.soe.clarkson.edu
Bitnet:    kweeder%sun.soe.clarkson.edu@clutx

List of Free Software network services and web applications which can be hosted locally.

Builds and other info for FiveNinjas Slice (CM1) and Slice2 (CM3) devices.
See https://forum.libreelec.tv/thread/8845-slice-fiveninjas-original-forum-dead/?postID=53810#post53810 for an announcement of a repackaging of LibreELEC.

F´ (or F Prime) is a software framework for the rapid development and deployment of embedded systems and spaceflight applications. Originally developed at NASA’s Jet Propulsion Laboratory, F´ is open-source software that has been successfully deployed for several space applications. It has been used for but is not limited to, CubeSats, SmallSats, instruments, and deployable.

Instructions for running Firefox as another, less privileged user. Found on https://www.tuhs.org/pipermail/tuhs/2017-March/010757.html
In the following post, https://www.qubes-os.org/intro/ was recommended as an improved way.

Need to encode, transmit, or store encrypted or signed data? saltpack is a streamlined, modern solution, designed with simplicity in mind. It is easy to implement & integrate. We've made few crypto decisions and instead leave almost all of the heavy lifting to the NaCl library.

saltpack is a binary message format, encoded using the MessagePack format. Messages are broken up into reasonable (1MB) chunks, over which regular NaCl operations are performed. We have taken pains to address many of the shortcomings of current message formats: (1) only authenticated data is output; (2) repudiable authentication is used wherever possible; (3) chunks cannot be reordered or combined with other transmissions; (4) the public keys of senders and recipients can be hidden; and (5) message truncation is detectable.

Implementations in Go and Python are available at https://saltpack.org/implementations  The format is used by https://keybase.io/

In December 1990, an application called WorldWideWeb was developed on a NeXT machine at The European Organization for Nuclear Research (known as CERN) just outside of Geneva. This program – WorldWideWeb — is the antecedent of most of what we consider or know of as "the web" today.

In February 2019, in celebration of the thirtieth anniversary of the development of WorldWideWeb, a group of developers and designers convened at CERN to rebuild the original browser within a contemporary browser, allowing users around the world to experience the rather humble origins of this transformative technology.

Found on https://www.11ty.dev/

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.