Welcome to MyGandiCloud?
It uses libMaia XML-RPC library written by Sebastian Wiedenroth which is also available under open source, and the current (or recent version) is included in the MyGandiCloud? source tree to simplify building the application.
The application is written in C++ with the Qt4 tools/libraries, and will happily build and run under Linux, MacOS X, and Windows.
Please note that the code is UGLY -- I am not a programmer really -- but at least it works (sort of).