Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
Gephi - Gephi is an open-source software for visualizing and analyzing large networks graphs.
Linkurious - Search and visualize your graph data through a simple web-based interface
Maltego - Maltego is an open source intelligence and forensics application.
Touchgraph Navigator - TouchGraph is the producer of data visualization software TouchGraph Navigator 2.
DataWalk - DataWalk is a software platform to connect numerous large data sets, both external and internal, into a single repository for fast visual analysis.