Joyent introduced Slingshot that provides offline support to Rails applications. Lack of off-line support has always been the Achilles' heel of SaaS-based applications that serve through HTTP -- at least it is one of the most frequently asked features at work! Slingshot provides (1) a container environment for running Rails applications on Windows and Mac OS X (2) synchronisation framework for off-line data. Cool bananas. Now, when is one coming for Django?