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Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Linkurious - Search and visualize your graph data through a simple web-based interface
draw.io - Online diagramming application
Maltego - Maltego is an open source intelligence and forensics application.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.