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.

Small. Sloccount counts under 2000 lines of code, small enough to allow audits. The binaries can be under 50KB, small enough for many embedded targets.
Easy to deploy. Just add monocypher.c and monocypher.h to your project. They compile as C99 or C++ and are dedicated to the public domain (CC0-1.0, alternatively 2-clause BSD).
Portable. There are no dependencies, not even on libc.
Honest. The API is small, consistent, and cannot fail on correct input.
Direct. The abstractions are minimal. A developer with experience in applied cryptography can be productive in minutes.
Fast. The primitives are fast to begin with, and performance wasn't needlessly sacrificed. Monocypher holds up pretty well against Libsodium, despite being closer in size to TweetNaCl. (More detailed benchmark)

It’s similar to vi as both are modal editors with curses interfaces. However, it differs from vi in that it has the same command syntax as ed. For example, in se to escape from append mode, you’d enter a line containing a single period instead of the vi way of hitting the escape key.

se has a long history dating back to the early 1980s. Beginning in 2013, Thomas Cort undertook the task of modernizing the early code and build system to get the software working on recent POSIX operating systems. The code base was straight forward and only used facilities available 25 years prior, and as a result, with a few modifications, it runs on many modern operating systems. Thomas' primary motivation is to preserve this bit of computing history. His goals are to squash any remaining bugs and make se as portable as possible. No major new features will be added.

For a long time, we were unhappy with having to care about security issues and Linux distribution maintenance on our various Raspberry Pis.
Then, we had a crazy idea: what if we got rid of memory-unsafe languages and all software we don’t strictly need?
Turns out this is feasible. gokrazy is the result.

GNU Emacs / N Λ N O is a set of configuration files for GNU Emacs such as to provide a nice and consistent look and feel as shown below. It is based on design principles I described in the article "On the design of text Editors" [1] that is available on arXiv. The light theme is based on Material colors [2] and the dark theme is based on Nord colors [3].

The philosophy of nano emacs is to stick as much as possible to vanilla emacs without introducing too much dependencies (or none if possible) and to keep it modular enough. The idea is for users to copy the part they are interested in such as to include them in their own configuration.

[1] https://arxiv.org/abs/2008.06030
[2] https://material.io/
[3] https://www.nordtheme.com/

Timeshift – free and open source software for creating snapshots of the file system
Also described on the german blog https://hyperblog.de/hoergen/2020/06/28/timeshift-snapshot-tool