Best Diagram Software for Linux of 2025

Dia is a versatile and freely available diagram editor designed for creating technical drawings and structured charts like UML diagrams, flowcharts, and electrical circuits. It supports multiple operating systems including Windows, Linux, and Mac OS X, and provides customizable shapes through downloadable libraries. Users can also script functionalities using Python and access extensive documentation for guidance. Troubleshooting resources, bug tracking, and mailing lists are available for community-driven support. With support in over 60 languages and a lightweight installer, Dia is accessible to a global audience.

yFiles is a versatile library for graph and network visualization and analysis. It offers powerful rendering, editing, and automatic layout features for complex diagrams—including organizational charts, flowcharts, and IT infrastructures. With advanced layout algorithms and robust interactivity, yFiles helps developers build scalable, clear visualizations across web, desktop, and mobile platforms. Supporting HTML/JavaScript, Java, and .NET, it’s widely used in industries like telecommunications, finance, and life sciences to clarify complex processes and data relationships. yFiles is the most capable and mature graph visualization SDK available commercially. The company behind yFiles was founded in 2000. yWorks has brought together graph visualization techniques and algorithms from academia, making it available to software developers to integrate perfect diagramming into their applications.

Astah Professional is a software design tool that enables you to build UML, ER diagrams, Data Flow Diagrams, Flowcharts, Mind maps and more to create a clear understanding among teams. Code generation, reverse engineering are also available. Works on Windows, Mac and Linux.

Cloudairy offers a unified platform for teams in industries such as engineering, IT, and sales to collaborate effectively in real-time. This AI-powered workspace supports a range of tools including diagramming, flowcharting, mind mapping, and wireframing, designed to streamline the creative and planning processes. Teams can design cloud infrastructures, create intuitive UX prototypes, and manage projects using Kanban boards and story mapping. With Cloudairy, users can improve collaboration, boost productivity, and enhance innovation, ensuring that all tasks from brainstorming to project execution are efficiently handled in one place.

Heptabase allows you to visually organize and comprehend your learning, research, and projects. To fully grasp what you've absorbed, you can visualize your notes using whiteboards, sections, and mind maps. Consolidate all your highlights, annotations, PDFs, journals, and research notes in one place to uncover new insights. Tackle intricate projects with ease and adaptability through the use of robust tags and properties. Moreover, it offers full offline access with impressive speed. You can sync and access your notes across multiple desktop and mobile devices, as well as web browsers. Access all your notes and files without needing an internet connection, and enjoy the ability to search, load, and edit your notes swiftly. Heptabase is designed as a visual note-taking tool specifically aimed at enhancing your ability to learn and delve into complex subjects, fostering a profound understanding of the topics that matter to you. Its design philosophy emphasizes aiding you in "understanding the topics you care about," rather than merely focusing on "taking more notes," making it a valuable resource for learners.

PlantUML is an open-source tool that offers a robust and adaptable solution for generating UML diagrams through straightforward text descriptions. It accommodates numerous diagram varieties, such as sequence, use case, class, component, state, and activity diagrams. Additionally, PlantUML goes beyond conventional UML by incorporating alternative diagram types like Gantt charts, mind maps, and entity-relationship diagrams. Its user-friendly syntax enables the creation of high-quality diagrams, simplifying the visualization of intricate systems and processes for developers, system architects, and project managers alike. Furthermore, users can conveniently export their diagrams in various formats, including PNG, SVG, LaTeX, and ASCII art. With its ability to integrate seamlessly into different tools and documentation workflows, PlantUML significantly boosts productivity for both teams and individual users, making it a valuable asset in any project. This flexibility and ease of use contribute to its growing popularity among professionals in diverse fields.

yEd simplifies the process of diagram creation, combining robust features with an easy-to-navigate interface, making it a delightful experience. This versatile desktop application allows users to swiftly and efficiently produce high-quality diagrams tailored to their needs. You can either create diagrams from scratch or import external data for a detailed analysis. With just a click, the automatic layout algorithms can organize even the most extensive data sets seamlessly. yEd also boasts a rich selection of attractive, pre-designed elements, providing an excellent starting point for new diagrams. Additionally, the application offers advanced capabilities for managing intricate data sets, thanks to its sophisticated mathematical layout algorithms that can assist in both automated and manual arrangements. Users will find that yEd not only enhances productivity but also empowers creativity in visual representation.