The Universal Radio Hacker is a software for investigating unknown wireless protocols. Features include
   hardware interfaces for common Software Defined Radios
   easy demodulation of signals
   assigning participants to keep overview of your data
   customizable decodings to crack even sophisticated encodings like CC1101 data whitening
   assign labels to reveal the logic of the protocol
   fuzzing component to find security leaks
   modulation support to inject the data back into the system
Dependencies
Required
   Python 3.4+
   numpy / psutil / zmq
   PyQt5
   C++ Compiler

Optional
   librtlsdr (for native RTL-SDR device backend)
   libhackrf (for native HackRF device backend)
   gnuradio / gnuradio-osmosdr (for GNU Radio device backends)

Another pdp-11 simulator written in Javascript.

diffoscope will try to get to the bottom of what makes files or directories different. It will recursively unpack archives of many kinds and transform various binary formats into more human readable form to compare them. It can compare two tarballs, ISO images, or PDF just as easily.

FlashForth is a Forth stamp system implemented on the Microchip 8-bit PIC18F and 16-bit PIC24, 30, 33 and the Atmel Atmega microcontroller families.

FlashForth also works on the popular Arduino UNO and MEGA boards.

FF (FlashForth) allows you to write and debug complex real-time applications. The complete system including the compiler is executing on the microcontroller.

A Forth interpreter, compiler, assembler, multitasker and user definable interrupts are provided.

A computer with a terminal emulator is used for communicating with FF via a serial or USB link.

This is TexiWeb Jr., a super simple literate programming system built
on top of Texinfo and implemented in awk.

The "tangle" piece was successfully bootstrapped on November 4, 2013.
The "weave" piece started producing a reasonable-looking document
on November 11, 2013.

As of Fri Feb 19 12:07:09 IST 2016, both the source code and literate programming document
are licensed under the GNU GPL. See the file COPYING.

Other repositories from the same author are interesting too: e.g.
the portable C compiler
 https://github.com/arnoldrobbins/pcc-revived
and a converter from RCS to git
 https://github.com/arnoldrobbins/simple-rcs2git

A large quantity of published data is available only in the form of plots and it is often difficult to extract numerical data accurately out of these pictures. There are several softwares available to aid this process, but most are either paid, difficult to use or lack some essential features. Also, many of the existing programs work only on a few specific operating systems and require installation by the user. Most programs only support 2D X-Y plots and so it is not possible to work with polar diagrams, ternary diagrams, microscope images or maps. With these issues in mind, WebPlotDigitizer was developed to be an easy to use, free of charge and opensource program that can work with a variety of plot types and images. This program is developed using HTML5 which allows it to run within a web browser and requires no installation on to the user's hard drive.
Distributed under the GNU General Public License Version 3.

Found on John D. Cook's blog
http://www.johndcook.com/blog/2016/04/20/how-to-digitize-a-graph/

A compact Raspian based distribution
for the Raspberry Pi board computer.

On-line dictionary (german<->english, but other languagues are supported).

Gpredict is a real-time satellite tracking and orbit prediction application. It can track an unlimited number of satellites and display their position and other data in lists, tables, maps, and polar plots (radar view). Gpredict can also predict the time of future passes for a satellite, and provide you with detailed information about each pass.

The RADclock project (formerly known under 'TSCclock') aims to provide a new system for network timing within two years. We are developing replacements for NTP clients and servers based on new principles, in particular the need to distinguish between difference clocks and absolute clocks. The term RADclock, 'Robust Absolute and Difference Clock', stems from this. The RADclock difference clock, for example, can measure RTTs to under a microsecond, even if connectively to the time server is lost for over a week!
The RADclock is available and can be used as an alternative to the ntpd daemon to provide convenient system clock synchronisation for systems running FreeBSD and Linux. In terms of local hardware, it exploits the availability of counters such as the HPET counter or the TSC (Time-Stamp-Counter) commonly found in PC architectures.