This website will be shut down pretty soon. There is no way to register a new account for SAR-EDU.
To get access not only to SAR-EDUs static content but also a vivid community you should head to its successor eo-college

Various software solutions are available for reading, processing and analyzing SAR data.
This section gives you an overview of available software packages.

You can find various tutorials for a selection of the presented software in the Units section.
Currently, SAR-EDU is offering tutorials for GAMMA, NEST, SARscape.