Capture and communicate acceptance criteria for software and systems, and how they are verified, in a way that’s understood by all project stakeholders, including end-users.

Subplot is a set of tools for specifying, documenting, and implementing automated acceptance tests for systems and software. Subplot tools help produce a human-readable document of acceptance criteria and a program that automatically tests a system against those criteria.

Subplot is currently in its ALPHA stage.

Found on https://en.m.wikipedia.org/wiki/PIC_(markup_language)

Software that aims to provide an easy to use (hopefully) universal blackbox for solving polynomials and secular equations.

Among its features you can find:
- Arbitrary precision approximation.
- Guaranteed inclusion radii for the results.
- Exploiting of polynomial structures: it can take advantage of sparsity as well as coefficients in a particular domain (i.e. integers or rationals).

It can be specialized for specific classes of polynomials. As an example, see the roots of the Mandelbrot polynomial of degree 2.097.151 computed in about 10 days on a dual Xeon server.

If you use MPSolve in your research, please cite it as follows:
Bini, Dario A., Fiorentino, Giuseppe, Design, analysis, and implementation of a multiprecision polynomial rootfinder. Numerical Algorithms 23.2-3 (2000): 127-173.
Bini, Dario A., and Robol, Leonardo. Solving secular and polynomial equations: A multiprecision algorithm. Journal of Computational and Applied Mathematics 272 (2014): 276-292.
Found via https://en.m.wikipedia.org/wiki/Aberth_method and https://en.m.wikipedia.org/wiki/MPSolve
See also the GitHub repository http://github.com/robol/MPSolve.git A simpler implementation of the Ehrich-Aberth-method can be found in https://github.com/robol/ea-roots

Found via https://github.com/zellyn/retrocomputing-hermit-packages

Forth-like, cross-platform language with native code compiler. Runs on
- Microsoft Windows XP/7/8/10
- macOS 10.7 and later (only 64-bit; 32-bit is no longer supported)
- Linux - Ubuntu 14.04 and later, and derivatives or similar systems based on libc6
- Raspbian (Raspberry Pi version of Debian Linux; also works for similar SBC Linux systems)
- Android 4.4 (API level 19, ARM devices) and later
- iOS 9.0 and later
Found via https://pikchr.org/home/doc/trunk/homepage.md

A port of Richard Hipp's pikchr https://pikchr.org/home/doc/trunk/homepage.md to the Go programming language.
See also the Apple I, ][ emulator https://github.com/zellyn/openemulator

Found via a link on https://docs.gitlab.com/ee/user/ssh.html

difftastic is a structural diff tool that compares files based on their syntax. So for example, if you conditionalize some statement, the diff would only show the addition of one if with its condition instead of showing one line added (the if (condition)) and the line with the statement being removed and re-added (because of indentation changes). In many cases, such structural diffs transport the meaning of a change much better than the typical line-based diffs.
Found on https://www.emacswiki.org/emacs/Magit

When hacking up Bash scripts, there are often things such as logging or command-line argument parsing that:
- You need every time
- Come with a number of pitfalls you want to avoid
- Keep you from your actual work
Here’s an attempt to bundle those things in a generalized way so that they are reusable as-is in most scripts.

We call it “BASH3 Boilerplate” or b3bp for short.
Found on https://willschenk.com/articles/2019/computer_setup_script/

SystemRescue (formerly known as SystemRescueCd) is a Linux system rescue toolkit available as a bootable medium for administrating or repairing your system and data after a crash. It aims to provide an easy way to carry out admin tasks on your computer, such as creating and editing the hard disk partitions. It comes with a lot of Linux system utilities such as GParted, fsarchiver, filesystem tools and basic tools (editors, midnight commander, network tools). It can be used for both Linux and windows computers, and on desktops as well as servers. This rescue system requires no installation as it can be booted from a CD/DVD drive or USB stick, but it can be installed on the hard disk if you wish. The kernel supports all important file systems (ext4, xfs, btrfs, vfat, ntfs), as well as network filesystems such as Samba and NFS.

Found via https://www.hpmuseum.org/forum/thread-18562-post-162245.html#pid162245
Located in Germany, close to Frankfurt am Main, it has a number of historic computers, calculators and other electronic devices, many of them still working.