Graphviz Alternatives for Linux

yEd Graph Editor is a versatile and free desktop application for creating high-quality diagrams of various types, including flowcharts, UML diagrams, BPMN diagrams, and more. It offers powerful automatic layout algorithms and a wide range of formatting options, making it suitable for both simple and complex visualizations.

PlantUML is an open-source tool that allows users to generate a wide variety of UML and other diagram types from a simple human-readable text description. It supports sequences, use case, class, activity, component, state, object, deployment, timing diagrams, and more, making it accessible and efficient for technical documentation and visualization.

Gephi is a powerful open-source software for exploring, visualizing, and manipulating networks and graphs of various types. It offers an intuitive interface for researchers, data scientists, and analysts to understand complex relational data.

UMLet is an open-source, Java-based UML modeling tool designed for both educational purposes and rapid creation of UML diagrams. It supports a wide range of diagram types and offers good integration with popular IDEs.

LaTeXDraw is a robust and free open-source vector graphics editor specifically designed for creating PSTricks code directly within a graphical interface. It simplifies the process of generating complex vector diagrams and illustrations for integration into LaTeX documents.