Exaile is a Trisquelized package from Ubuntu Universe for both Precise and Trusty. However, despite compatible licensing it is not in the Belenos repos.
Issue raised in response to this forum report
http://trisquel.info/en/forum/trouble-exaile-install
Automatically closed -- issue fixed for 2 weeks with no activity.
Some admin please "close" this bug.
exaile is now in the repos
Looks very much like the reason is errors in the new build system. At least those were all that kept me from building and testing a Belenos package. Patch duly submitted in this thread:
http://listas.trisquel.info/pipermail/trisquel-devel/2014-November/000871.html