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Kwant is a Python package for numerical calculations on tight-binding models with a strong focus on quantum transport. It is designed to be flexible and easy to use. Thanks to the use of innovative algorithms, Kwant is often faster than other available codes, even those entirely written in the low level FORTRAN and C/C++ languages.

Tight-binding models can describe a vast variety of systems and phenomena in quantum physics. Therefore, Kwant can be used to simulate metals, graphene, topological insulators, quantum Hall effect, superconductivity, spintronics, molecular electronics, any combination of the above, and many other things.

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Gephi is an interactive visualization and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs. Runs on Windows, Linux and Mac OS X. Gephi is open-source and free.

SimpleScreenRecorder is a Linux program created to record programs and games.

Get free online courses from the world’s leading universities. This collection includes over 700 free courses in the liberal arts and sciences. Download these audio & video courses straight to your computer or mp3 player.

The Linux Foundation is the nonprofit consortium dedicated to fostering the growth of Linux. Founded in 2000, the Linux Foundation sponsors the work of Linux creator Linus Torvalds and is supported by leading technology companies and developers from around the world.

The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system that we have created is called Debian.

FLOSS Manuals (FM) is a collection of different language communities that produce original documentation about Free Software. This site is the home for the The FLOSS Manuals Foundation (FMF), which oversees and supports the general activities of the various language communities.

Wikimedia Commons is a media file repository making available public domain and freely-licensed educational media content (images, sound and video clips) to everyone, in their own language. It acts as a common repository for the various projects of the Wikimedia Foundation, but you do not need to belong to one of those projects to use media hosted here. The repository is created and maintained not by paid archivists, but by volunteers.