Best Diagram Software for Linux

Dia is an open-source diagramming application that allows users to create a wide range of structured diagrams such as flowcharts, network layouts, and UML designs. Compatible with Windows, Linux, and Mac OS X, Dia offers downloadable shape libraries and scripting options. It is licensed under GPLv2 and includes resources like documentation, bug trackers, and community support.

yFiles is a powerful library for visualizing and analyzing graphs and networks. It provides comprehensive features for rendering, editing, and automatically laying out complex diagrams — from organizational charts and flowcharts to IT infrastructures. With advanced layout algorithms, interactive capabilities, and strong performance, yFiles enables developers to integrate scalable and clear graph visualizations into web, desktop, or mobile applications. Supporting multiple platforms like HTML/JavaScript, Java, and .NET, yFiles is used across industries such as telecommunications, finance, and life sciences to make complex processes and relationships easy to understand.

Astah Professional is a software modeling tool that enables you to build UML, ER diagrams, Data Flow Diagrams, Flowcharts, mind maps and more to create a clear understanding among teams. Text-to-models, pre-installed templates and libraries help you create diagrams easy and fast. Unlike drawing-tools, you create "models" with Astah. So you can just drag-and-drop models to create diagrams. Any changes to the models will apply for all the diagrams so you can make sure that your models and diagrams are consistent.

Heptabase empowers you to visually make sense of your learning, research, and projects. To truly make sense of what you've learned, visualize your notes with whiteboards, sections, and mindmaps. Bring all your highlights, annotations, PDFs, journals, and research notes together to discover new insights. Manage complex projects with clarity and flexibility by using powerful tags and properties. And of course, full offline access with blazing-fast speed. Sync and access your notes across unlimited desktop devices, mobile devices, and web browsers. Access all notes and files without an internet connection. Search, load, and edit your notes with blazing-fast speed. Heptabase is a visual note-taking software specifically designed to help you learn and research complex topics, establishing a deep understanding of things you care about. The design of Heptabase focuses on helping you better "understand the topics you care about," rather than simply "taking more notes."

PlantUML is a powerful and flexible open source tool that allows users to create UML diagrams using simple text descriptions. It supports various diagram types, including sequence, use case, class, component, state, and activity diagrams. PlantUML also extends beyond traditional UML with support for other diagram types such as Gantt charts, mind maps, and entity-relationship diagrams. The platform uses a straightforward syntax to generate high-quality diagrams, making it easy for developers, system architects, and project managers to visualize complex systems and processes. Users can export diagrams in multiple formats like PNG, SVG, LaTeX, and ASCII art. PlantUML is compatible with a range of tools and integrates seamlessly into documentation workflows, enhancing productivity for teams and individuals.

yEd makes diagram creation easy and fun with its powerful features and intuitive user interface. yEd is a powerful desktop application that can be used to quickly and effectively generate high-quality diagrams. Create diagrams manually, or import your external data for analysis. Our automatic layout algorithms arrange even large data sets with just the press of a button. yEd comes with an extensive palette of beautiful, ready-to-use elements to get you started with your first diagrams. yEd provides powerful functionality for the layout of complex data sets. Its highly sophisticated mathematical layout algorithms can be used either to automatically arrange diagram elements, or to support you when undertaking a manual layout.