Public search engine and digital library for scientific and academic papers.

Article recommendation and literature discovery service in biology and medicine.

Papers helps you collect and curate your research material.

Helps people find resources available at their library through a single search

A non-profit plasmid sharing platform

Literary annotation protocol: create annotation hashtag, "annotag", based on ISBN.

Annotate and collaborate on documents and images.

A digital archive of early modern annotated books.

An open-source, a suite of collaborative web-based annotation platform.

View and annotate digital pathology images.