It's cloud software for running a full IaaS service of your own, on your own machines, with Ganeti at the backend. There is a client, called kamaki, see http://www.synnefo.org/docs/kamaki/latest/index.html, but it's true we should have a separate page for it.
About the "trial" option, we have it as "Try it out" on the first page of http://www.synnefo.org. If you saw it on okeanos.io, we'll change it there accordingly.
Anyway, have you had a chance to try out? :)