OPEN ENTITY EXTRACTION SYSTEM

Methods, computer program products, and systems related to providing gadgets that generate content based on entities extracted according to patterns defined by extractors are provided. A plurality of distinct extractors that define patterns for identifying entities in text are received from a plurality of users. The extractors are stored in a repository. The pattern defined by each of the extractors is processed into a pattern matching engine. The extractors are made available for subscription from a first user subscribing to a first extractor. A modification indication is received from a composition program regarding a first document of a first user, and in response to receiving the modification indication, the pattern matching engine corresponding to the first extractor is applied to the first document and identifies a first entity. The first entity is provided to a first software gadget that presents information relating to the first entity to the user.