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.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.