Google Apps Improved Login (GAIL) provides Google Apps administrators with two oft-requested features: the ability to customize the login page and the ability to log in as their users. GAIL is designed to run on Google's App Engine so that administrators do not need to have their own Web server. GAIL works by making use of the SAML Single Sign-On (SSO) Service for Google Apps. Premier and Education Editions of Google Apps are supported. Standard Edition is not.
Objectify-Appengine is a thin Java wrapper around Google App Engine's low-level datastore API that allows you to persist type-safe POJO objects. It provides a human-friendly query interface, generified key, query, and prepared query classes, GWT-able entity objects, and transactions in one lightweight jar file with no dependencies.
CaroView for the Google cloud facilitates online map creation and publishing of geo-content from fusion tables and other online sources and services You can configure, author, and publish your map from the browser, with no programming required. It will render your geodata from Google fusion tables and external sources (GeoRSS, KML, or ArcGIS Server). You can select from a large number of plugins to use in your map: Twitter, Yelp, events, weather, and many more.