From their site: Developers of installed applications have the option of using a programmatic login method to access Google services protected by user login. An installed application is installed on a device, such as a desktop computer or a cell phone, as opposed to a web application. With programmatic login implemented, an application's user can log into their Google account from inside the application. The application then contacts Google with the login data and requests access to a specified Google service, such as Calendar. Once access is authorized, the user can create, read, update, or delete data as needed using the application interface. Programmatic login and authentication is a big step up from the "low-tech" approach, which is to simply include the user's login name and password in every request to Google. With programmatic login, Google supplies the application with a token that can referenced in all requests instead of login data.
The following is a list of libraries from ProgrammableWeb's Library Directory that matched your search term. Although there many different interpretations of the word "library" among software developers, ProgrammableWeb adheres to a specific definition so as to clearly distinguish libraries from SDKs and frameworks in a way that will facilitate clean search results. In ProgrammableWeb's parlance, the term "library" is strictly used to describe a platform-specific software tool that, when installed, results in the provisioning a specific API. Conversely, SDKs are exclusively for consuming APIs and Frameworks are agnostic to specific APIs. If you think a library, SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.