Meson is an open source build system meant to be both extremely fast, and, even more importantly, as user friendly as possible.

The main design point of Meson is that every moment a developer spends writing or debugging build definitions is a second wasted. So is every second spent waiting for the build system to actually start compiling code.

Peregrine is a fast and flexible open-source software GNSS receiver. It can be used as a standalone application to post-process GNSS data all the way to PVT solutions or as from within IPython as a toolkit for GNSS data exploration.

Peregrine is written in Python for flexibility and ease of development and uses the libswiftnav C library for speed.

Full documentation available online at http://docs.swift-nav.com/peregrine

Found via https://github.com/odrisci/gnss-sdr, a fork of GNSS-SDR implementing code-less tracking for Galileo E1 PRS signals, which in turn was found in "Codeless Code Tracking of BOC Signals" by Cillian O’Driscoll, James T. Curran; Proceedings of the 29th International Technical Meeting of the ION Satellite Division, ION GNSS+ 2016, Portland, Oregon, September 12-16, 2016, pp. 497-508.

You supply an antenna and a complex (I/Q) mixer to convert the radio spectrum to a low IF. Then send that IF to your computer using the sound card, Ethernet or USB. The Quisk software will read the I/Q data, tune it, filter it, demodulate it, and send the audio to headphones or speakers. Quisk has a microphone input and a key input so it can operate as a complete transceiver.

mpmath is a free (BSD licensed) Python library for real and complex floating-point arithmetic with arbitrary precision. It has been developed by Fredrik Johansson since 2007, with help from many contributors.

Hy is a multi-paradigm general-purpose programming language in the Lisp family. It’s implemented as a kind of alternative syntax for Python. Compared to Python, Hy offers a variety of extra features, generalizations, and syntactic simplifications, as would be expected of a Lisp. Compared to other Lisps, Hy provides direct access to Python’s built-ins and third-party Python libraries, while allowing you to freely mix imperative, functional, and object-oriented styles of programming.
Found on https://en.wikipedia.org/wiki/Lisp_(programming_language)#Genealogy_and_variants

Matplotlib is a comprehensive library for creating static, animated, and interactive visualizations in Python.

Bitmessage is a P2P communications protocol used to send encrypted messages to another person or to many subscribers. It is decentralized and trustless, meaning that you need-not inherently trust any entities like root certificate authorities. It uses strong authentication which means that the sender of a message cannot be spoofed, and it aims to hide "non-content" data, like the sender and receiver of messages, from passive eavesdroppers like those running warrantless wiretapping programs. If Bitmessage is completely new to you, you may wish to start by reading the whitepaper https://bitmessage.org/bitmessage.pdf

Not sure how up to date it is, version 0.6.1 is dated 2016-08-21, the latest one  0.6.3.2 was released 2018-02-14
https://github.com/Bitmessage/PyBitmessage/releases/

According to https://www.reddit.com/r/bitmessage/comments/cjxk9s/current_status_of_pybitmessage/ (2019-07-30) development is on-going.
This can also be seen on github, e.g. https://github.com/Bitmessage/PyBitmessage/issues/1712#issuecomment-830636842
One of the difficulties seems to be the transition from Python2 to Python3.

Uses proof-of-work.

Found on https://karl-voit.at/2014/04/10/bitmessage/

Pre-commit is a multi-language package manager for pre-commit hooks. You specify a list of hooks you want and pre-commit manages the installation and execution of any hook written in any language before every commit. pre-commit is specifically designed to not require root access.

This package provides a library and a command-line tool named wormhole, which makes it possible to get arbitrary-sized files and directories (or short pieces of text) from one computer to another. The two endpoints are identified by using identical “wormhole codes”: in general, the sending machine generates and displays the code, which must then be typed into the receiving machine.

The codes are short and human-pronounceable, using a phonetically-distinct wordlist. The receiving side offers tab-completion on the codewords, so usually only a few characters must be typed. Wormhole codes are single-use and do not need to be memorized.

Package, dependency and environment management for any language—Python, R, Ruby, Lua, Scala, Java, JavaScript, C/ C++, FORTRAN, and more.

Conda is an open source package management system and environment management system that runs on Windows, macOS and Linux. Conda quickly installs, runs and updates packages and their dependencies. Conda easily creates, saves, loads and switches between environments on your local computer. It was created for Python programs, but it can package and distribute software for any language.