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.

liquid-dsp is a free and open-source signal processing library for software-defined radios written in C. Its purpose is to provide a set of extensible DSP modules that do no rely on external dependencies or cumbersome frameworks. The project is now hosted on liquid-dsp is a free and open-source signal processing library for software-defined radios written in C. Its purpose is to provide a set of extensible DSP modules that do no rely on external dependencies or cumbersome frameworks. The project is now hosted on http://github.com/jgaeddert/liquid-dsp/

eCryptfs is a POSIX-compliant enterprise cryptographic stacked filesystem for Linux. eCryptfs stores cryptographic metadata in the header of each file, so that encrypted files can be copied between hosts; the file will be decrypted with the proper key in the Linux kernel keyring. There is no need to keep track of any additional information aside from what is already in the encrypted file itself. You may think of eCryptfs as a sort of "gnupg as a filesystem".

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Tomb is an 100% free and open source system for file encryption on Linux, facilitating the backup of secret files. Tomb is written in code that is easy to review and links commonly shared components.

Tomb generates encrypted storage folders to be opened and closed using their associated keyfiles, which are also protected with a password chosen by the user.

A tomb is like a locked folder that can be safely transported and hidden in a filesystem; its keys can be kept separate, for instance keeping the tomb file on your computer harddisk and the key files on a USB stick.

Tomb is a simple tool to manage encrypted storage on GNU/Linux, from the hashes of the dyne:bolic nesting mechanism.

Intel-based laptop and Tablets trying to use only free software (including BIOS etc.).

Ruby-based package manager for OS X.

Requires X11, gpg.

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.

Detailed description of the shellshock vulnerability and the lessions to be learned from it.