Harmony is framework for defining, updating, and synchronizing views over strings, trees, and relations. It can be used, for example, to synchronize the bookmark files of several different web browsers, to convert address books represented in vCard to CSV, and to map between BiBTeX and RIS-formatted bibliographic databases.
Harmony Project home page
The YouTube APIs and Tools open up a full range of YouTube functionality for web pages, software and devices. Users of the API can upload new videos, edit video metadata such as comments and favorites and modify user settings. Your client application can request a list of videos that match specific search criteria, get access to the most popular YouTube videos or retrieve and maintain YouTube user information such as playlists, subscriptions or contacts.
YouTube APIs and Tools – Google Code