Google App Engine
Google App Engine is a platform for web applications development and hosting in the cloud. If you don’t own a domain you can use the one the platform provides: <mysite>.appspot.com
All applications in Google App Engine must be written in Python, Java or Go. Frameworks (like Django) and modules are supported but developers have the applications have read only access to the file system, so the only possibily of writing files from the app would be through a virtual file system.
The data store is accessed not through SQL but through ‘GQL’, a SQL-like language which doesn’t allow to perform any kind of joins.