SIREN.io - Siren is an investigative intelligence platform.
GraphThing - GraphThing is a tool that allows you to create, manipulate and study graphs.
DataWalk - DataWalk is a software platform to connect numerous large data sets, both external and internal, into a single repository for fast visual analysis.
jsflap - A web-based NFA and DFA construction and testing tool.
SpiderFoot - Open source intelligence (OSINT) automation tool.
Gephi - Gephi is an open-source software for visualizing and analyzing large networks graphs.