Jointly Administered Knowledge Environment - an online, open source (and open data) database which attempts to store information about where journals and periodicals are indexed and stored in fulltext. jake also has rudimentary functionality for linking directly to fulltext of articles when supplied with the appropriate bibliographic information.

Originally started by Dan Chudnov at Yale, it has since become its own entity and adopted by others. Key jake sites are now located at SFU library and Openly Informatics.