The CloudBees ecosystem, mentioned in detail at http://www.cloudbees.com/platform/ecosystem/tech-partners.cb, includes a larger set of third-party services. Most of them aren't available on the services subscription page as they are validated partner services.
Such third-party services aren't as integrated to the CloudBees platform as Sonar or SendGrid are. CloudBees worked with such partners to agree about the commercial relations, to check whether both the services can smoothly work together, and documented the integration steps in wiki, but there is no subscription or billing integration between them.
Even the user experience is not as smooth in such integrations. The main benefit is that adding new partners to the ecosystem doesn't require any lengthy integration work. So there are more opportunities for you to get adequate services for your own use. The services that are very popular could later evolve into integrated partners.
Thanks to this model, the CloudBees...