ShortURL shortens URLs using different Web services APIs. It supports Google goo.gl, TinyURL, Adf.ly, and YouTube. If a given short URL service fails, it may fallback to a different URL.
CygnusCMS is a CMS for Google App Engine. It is scalable and easy to use. It lets you upload multiple images with one set of metadata for the group. It also features integration with Flickr, Twitter, and Last.fm.
A content management system for blogging, forums, pages, wiki, and more.
An interactive symbolic-numeric system dedicated to celestial mechanics.