GReF (Graphical Referencing Framework) is a web application developed at the University of California at Berkeley. It allows users to link data on scanned field notebook pages to records in a specimen database.
The web client is built using the Google Web Toolkit. Server side code is built using Apache Tomcat, Java 1.5, Hibernate, and PostgreSQL.
The GReF project is currently in maintenance mode. A maintenance release is deployed on the last Friday of each month.