The Affero GPL is a FLOSS, OSI-certified license that by-and-large solves the "software as a service" problem, by making sure that if SaaS providers publically perform a version of the software over a computer network, they also have to make that version available under the license. This is quite consistent with the general norms of FLOSS development and does not actively introduce discrimination over private use of the software, as other licenses do.