Methods, computer systems, and computer-storage media are provided for augmenting Web-based search results with relevant content received from third-party applications. Each of a plurality of third-party applications is registered to obtain an indication of entity types associated with the each registered third-party application. An annotated search query is received that includes the original inputted search query and at least an entity type associated with the search query. The annotated search query is communicated to those third-party applications having an indicated entity type that matches the entity type associated with the inputted search query. Search results that are relevant to the annotated search query are received from the applications and presented on a results page.