ActiveState's Stackato private PaaS platform (http://www.activestate.com/stackato) has support for Heroku buildpacks to deploy (http://docs.stackato.com/deploy/buildpack.html), as well as the usual options for polyglot app deployments (it also has a 100% compatible Cloud Foundry API). This is useful when you want portability (deploy on a PaaS that you have full control over).