RaySession is a GNU/Linux session manager for audio programs such as Ardour, Carla, QTractor, Patroneo etc... The principle is to load together audio programs, then be able to save or close all documents together. It communicates with programs using the Non Session Manager API, so programs compatible with NSM are also compatible with RaySession.
An integrated client can save and restore JACK connections. Except this, RaySession doesn't deals with JACK, the recommended user behavior is to use it when JACK is already started.