I, Librarian is a PDF manager, a free and open source web application, which enables individual researchers or a small group of researchers to create an annotated library of scientific PDF articles. It enables smart browsing and fast searching in reference data and PDF files, and includes an advanced tool for mining scientific literature from PubMed, PubMed Central, NASA ADS, arXiv, IEEE Xplore, JSTOR® and HighWire Press®.