<p>SEASR's OpenNLP Entities to Protovis Network Graph is a free tool for extracting entities within a specified sentence distance within a text. The OpenNLP system is used for entity extraction, and their relationships are represented in a link node network graph generated in Protovis.&nbsp;</p> <p>While SEASR is still active, their page for OpenNLP Entities to Protivis Network Graph is no longer available. It can still be viewed via the Internet Archive.</p>