We just rolled out our developer platform (beta). It is based on the same ideas that power Github Services. You can write small (but powerful) apps and push the code to us. We take care of hosting, authentication, rendering/saving forms etc and list your apps in the app directory where anyone can add them and use them.
So far we have written small apps like Campfire, Hipchat, Github Issues, Pivotal tracker etc to showcase the capabilities of the platform. The app directory is at https://supportbee.com/apps
The development process should be (hopefully) pretty straight forward. We have also bundled a nice web console to help you develop/test your apps quickly. I would love for you guys to give us feedback on the development experience