Trusted execution environment for ARM-based computers, based on
https://en.wikipedia.org/wiki/Xv6

CubicSDR is a cross-platform Software-Defined Radio application which allows you to navigate the radio spectrum and demodulate any signals you might discover.  It currently includes several common analog demodulation schemes such as AM and FM and will support digital modes in the future.  Many digital decoding applications are available now that can use the analog outputs to process digital signals by “piping” the data from CubicSDR to another program using software like Soundflower, Jack Audio or VBCable.

Currently CubicSDR supports the RTL-SDR which is an inexpensive SDR device that can be purchased online for about $10 and up.   Search for “RTL2832U” and “820T” or “820T2” on sites such as eBay or Amazon to see what’s available.   Support for more advanced and higher bandwidth devices will be added in the future.

The Password Hashing Competition (PHC) is an effort organized to identify new password hashing schemes in order to improve on the state-of-the-art (PBKDF2, scrypt, etc.), and to encourage the use of strong password protection. Applications include for example authentication to web services, PIN authentication on mobile devices, key derivation for full disk encryption, or private keys encryption.

The Deep Sweep is an aerospace probe scanning the otherwise out-of-reach signal space between land and stratosphere, with special interest placed in UAV/drone to satellite communication.

Plan 9 from User Space moved from http://swtch.com/plan9port here. See also the Google discussion group https://groups.google.com/forum/#!topic/plan9port-dev/OqSvUDfwS-M.

Baudline is a time-frequency browser designed for scientific visualization of the spectral domain.  Signal analysis is performed by Fourier, correlation, and raster transforms that create colorful spectrograms with vibrant detail.  Conduct test and measurement experiments with the built in function generator, or play back audio files with a multitude of effects and filters.  The baudline signal analyzer combines fast digital signal processing, versatile high speed displays, and continuous capture tools for hunting down and studying elusive signal characteristics.

Code can be found on https://github.com/froggey/Mezzano
Documentation is sparse, but it appears to target x86.

Executable Wiki: non-linear, text-based shell. I am not explaining this well, take a look at the screencasts.

Despite the availability of many excellent books and scientific articles and daily discussions on comp.lang.fortran, information about modern Fortran programming is sometimes difficult to find. There is a need for something that changes faster than books, papers, and documentation, but is more persistent and organized than a newsgroup. The Fortran Wiki aims to fill this void. Its mission is to provide an open and community-driven venue for documenting and discussing all aspects of the Fortran language, from compilers and standards and best practices and design patterns.

V3 SNOWLeo SDR is a low-cost open source software defined radio platform based on Xilinx ZYNQ SoC and MYRIAD RF module. It include Giga Ethernet, USB OTG, HDMI, SDIO and USB-UART. SNOWLeo SDR is equipped an MYRIAD module that support 300MHz~3.8GHz, 28MHz BW application, such as WiFi, LTE or WiMax.