DataWalk - DataWalk is a software platform to connect numerous large data sets, both external and internal, into a single repository for fast visual analysis.
SpiderFoot - Open source intelligence (OSINT) automation tool.
Maltego - Maltego is an open source intelligence and forensics application.
Netglub - Netglub, the really open source information gathering solution.
dradis - Dradis is the open-source reporting and collaboration tool for IT security professionals.
Sentinel Visualizer - Link Analysis, Data Visualization, Geospatial Mapping, and Social Network Analysis (SNA) with Sentinel Visualizer