Out of the box OpenShift has a variety of languages and frameworks as well as ProstgreSQL, MySQL, and MongoDB database options (plus custom cartridges). You get three free gears (i.e. containers) so up to 3 small apps.

I've only used it to create a small Python/Flask app http://wwos-bitmason.rhcloud.com/ but there are lots of examples and information on the OpenShift blog.

[Disclaimer: I work for Red Hat.]