I'm not sure if it's still in development. On sourceforge (!) it looks like there are no updates since 2014, and French wikipedia(https://fr.wikipedia.org/wiki/Schillix) says it's not been updated since 2012.
* https://en.wikipedia.org/w/index.php?diff=760505445&oldid=76...
Certainly the Schily Tools bug ticketing system has seen activity within the last month, and there was a release on 2018-10-30 and one before that on 2018-10-11.