Graphviz
Graphviz is open source graph visualization software. It has several main graph layout programs.
Graphviz Alternatives
The best Graphviz alternatives based on verified products, community votes, reviews and other factors.
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PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
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Online diagramming application
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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.
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Gephi is an open-source software for visualizing and analyzing large networks graphs.
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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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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.
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OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.
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UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
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The JavaScript toolkit for graph visualization
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StarUML
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UMLet - Free UML Tool for Fast UML Diagrams
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ArgoUML, free and safe download. ArgoUML latest version: Open-source diagramming application for personal computers. ArgoUML is a program that allows users to create complex and professional diagrams.
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Gaphor is a Python-based, open source, multiplatform and multipurpose modeling application for creating nice UML diagrams for documentation.