The source of this project is hosted on https://svn.fhem.de

You can download the latest version as a .zip file at
  https://svn.fhem.de/trac/browser/trunk/fhem?rev=HEAD&format=zip

or you can check out a read-only version with
  svn co https://svn.fhem.de/fhem/trunk/fhem

If you wish to contribute to the project, then read the details on
  https://svn.fhem.de/#readwrite