Abstract: Systems and methods are described for providing a predictive session-based search engine. A predictive session-based search engine may identify and pre-fetch data from various data sources that is likely to be accessed during a particular session. Data sources may include other search engines, databases, web servers, and other sources of information. A plug-in controller architecture, which may include templates, computer-executable instructions, application programming interface (API) calls, or other information that enables access to a particular data source, may be used to allow the predictive session-based search engine to obtain data from the data sources. The predictive session-based search engine may store and index the data it obtains, and may answer search queries during the session with data that is stored and indexed locally rather than retrieving data from the original sources.