[Editor's Note: The Google Desktop API is no longer available. This profile is maintained for historical and research purposes only.]
This is Windows-based client SDK that can also integrate with online content. It uses a Windows COM programming model. From their site: Google Desktop indexes, caches, and searches content on your computer. Its Sidebar provides constant data display from multiple information sources. Through the Google Desktop Software Development Kit's APIs, your applications can send content to the Desktop engine for indexing and storage, send search queries directly to Desktop, define new Sidebar gadgets, communicate between different users' Sidebar gadgets, redefine Desktop user interface actions, and define new Desktop events.
Google has a lot of APIs, more than any other company we track. Perhaps as part of adding many APIs, the search giant also has to remove them from time to time. Recently the company has become more liberal in its platform pruning, with at least three separate announcements this year. Most recently Google dropped three more APIs, including the Google Buzz API.
It has been a long spell of “Operation Product Cleanup” at Google. Some of the high profile announcements like shutting down of the Google Translate API and the outrage have seen it being reframed as a paid version. Others, like Google Maps Flash, were not so lucky in the most recent round of API euthanasia.