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Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
sn0int - sn0int is a semi-automatic OSINT framework and package manager
draw.io - Online diagramming application
Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
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.
SIREN.io - Siren is an investigative intelligence platform.