The official repository for the GSPBox is hosted on Github. It is licensed in GPLv3 so it can be freely cloned and forked.
Access is possible by using a Git client to clone the repository at
git clone https://github.com/epfl-lts2/gspbox.git
If you want to contribute, please get in touch with us. We can provide you access to the development sources.
The design ideas of the GSPBOX are described in the design document. This explains the reasoning behind the choices made in the development of the toolbox, variable naming etc.
All online help on the GSPBOx is generated from the function headers in the Matlab functions, using the mat2doc documentation system. The formatting and layout of the function headers and mat2doc in general is described in the mat2doc documentation.