Graphviz
Graphviz is open source graph visualization software. It has several main graph layout programs.
15 Alternatives To Graphviz
Code2Flow
An easy solution to create product flows.
Dia
Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
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Gephi
Gephi is an open-source software for visualizing and analyzing large networks graphs.
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LucidChart
LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Netglub
Netglub, the really open source information gathering solution.
PlantUML
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Poortego
Open-source python project to handle the storage and linking of open-source intelligence (ala Maltego) - mgeide/poortego
![images/2020/04/StarUML.png}}](/images/2020/04/StarUML_hucaf810b68b7013af741ed863120bcd92_6054_64x64_fill_q75_box_center_3.png)
StarUML
StarUML
Trumpet
Postcards to the President
![images/2020/04/UMLet.png}}](/images/2020/04/UMLet_hubc01f5330a7fff550d807d437a9f8c4e_16595_64x64_fill_q75_box_center_3.png)
UMLet
UMLet - Free UML Tool for Fast UML Diagrams
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Visio
Simplify and communicate complex information using data-linked diagrams.
dradis
Dradis is the open-source reporting and collaboration tool for IT security professionals.
xfig
Xfig is a free and open source vector graphics editor which runs under the X Window System on most…
![images/2020/03/yed-graph-editor.png}}](/images/2020/03/yed-graph-editor_hu13abad03ef7e634c7c6be33c9bc3a6cb_13930_64x64_fill_q75_box_center_3.png)
yEd Graph Editor
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.