Browse free open source Diagram software and projects for Windows and Mac below. Use the toggles on the left to filter open source Diagram software by OS, license, language, programming language, and project status.

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  • 1
    PlantUML

    PlantUML

    Generate diagrams from textual description

    Generate UML diagram from textual description. PlantUML is not affected by the log4j vulnerability. The easiest way to test PlantUML is in an online solution that has PlantUML embedded, such as our online server. After testing, you may want to install PlantUML locally. Run (or have your software call) PlantUML, using sequenceDiagram.txt as input. The output is an image, which either appears in the other software, or is written to an image file on disk. Diagrams are defined using a simple and intuitive language. (see PlantUML Language Reference Guide). Images can be generated in PNG, in SVG or in LaTeX format. It is also possible to generate ASCII art diagrams (only for sequence diagrams).
    Downloads: 48 This Week
    Last Update:
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  • 2
    Yaoqiang BPMN Editor

    Yaoqiang BPMN Editor

    an Open Source BPMN 2.0 / DMN 1.1 Modeler

    Yaoqiang BPMN Editor is a graphical editor for business process diagrams, compliant with OMG specifications (BPMN 2.0 / DMN 1.1).
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    Downloads: 40 This Week
    Last Update:
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  • 3
    GoJS

    GoJS

    JavaScript diagramming library for interactive flowcharts & org charts

    Build interactive flowcharts or flow diagrams. Let your users build, modify, and save diagrams with JSON model output. Visualize state charts and other behavior diagrams. Create diagrams with live updates to monitor state, or interactive diagrams for planning. GoJS allows considerable customization of links and nodes to build all kinds of diagrams. Visualize flow, or connect pipes. Create genogram and medical diagrams, or editable family trees with collapsible levels. Create classic org charts for viewing or editing. Automatic layouts make different visualization options easy. Dynamically add ports and custom link routing. Use data-bindings to save and load routes within the Model JSON. Use groups as containers and subgraphs, with group members bound by their own rules and layouts. Model industrial processes, workflows, SCADA diagrams and more.
    Downloads: 3 This Week
    Last Update:
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  • 4
    draw.io

    draw.io

    JavaScript client-side editor for general diagramming & whiteboarding

    draw.io is a JavaScript, client-side editor for general diagramming and whiteboarding. draw.io, this project, is a configurable diagramming/whiteboarding visualization application. draw.io is jointly owned and developed by JGraph Ltd and draw.io AG. draw.io is a diagramming or whiteboarding application, depending on which theme is selected. It is not an SVG editing app, the SVG export is designed only for embedding in web pages, not for further editing in other tools. The application is designed to be used largely as-is. It's possible to alter the major parts of the interface, but if you're looking for an editor with very specific editing features, the project is likely not a good base to use. That is to say, if you wanted to create/deploy a whiteboard or diagramming application where the functionality in the main canvas is as this project provides, it is more likely to be a good base to use.
    Downloads: 2 This Week
    Last Update:
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    ioDraw

    ioDraw

    Free software for making Flow chart, Mind map, Gantt chart, Whiteboard

    ioDraw is a free online drawing software, which is used to make flow chart, mind map, Gantt chart, whiteboard, mermaid, poster, and more—no registration required. It also features AI-generated charts.
    Downloads: 13 This Week
    Last Update:
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  • 6
    Eulumdat_3D - QLumEdit2

    Eulumdat_3D - QLumEdit2

    show and edit eulumdat files

    Eulumdat_3D the better Eulumdat viewer and editor. You can view ldt files as 3D ,compare two luminaires, print a simple datasheet. From given light distribution you can create different ldt files depending on light flux and CCT also as app under https://play.google.com/store/apps/details?id=com.riloc.eulumdat
    Downloads: 2 This Week
    Last Update:
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  • 7

    BizDiag

    Business graphics diagramming application + customizable shape lib.

    BizDiag V1.9 All new version (based on Mono and GTK#, developed with MonoDevelop 2.4.1). BizDiag V1.0, V1.1, V1.2 Business graphics diagramming application + diagram editor library for vector graphics (based on Piccolo2D from University of Maryland, .NET and Windows.Forms developed with Visual Studio 2008). Supports browser-enabled special SVG file format for import and export and customizable shape library.
    Downloads: 0 This Week
    Last Update:
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  • 8
    M. Vezelis Draw

    M. Vezelis Draw

    Project productivity & cost estimations tool which creates Gantt Chart

    That's project development productivity and cost estimations tool which reflects it in the form of multiple custom diagrams, including the Gantt Chart. The tool provides succinct project metrics related information, and on demand information under each diagram. It allows a user to calculate Function Points, and estimate cost based on COCOMO Basic and Intermediate models.
    Downloads: 0 This Week
    Last Update:
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  • 9
    Modeling software including Archimate
    Openmodeling has currently 5 modules available: • Application portfolio management • ArchiMate 3.2 architecture (including The Open Group Model Exchange) • Demo conceptual modeling, both versions 3 and 4 • Efqm quality assessment • Business and system modeling Openmodeling facilitates modeling online controlled by a web interface using SVG. A wide range of modeling techniques is available, including Demo and Archimate diagrams. All functionality is web-based, including administrator tasks. Storage is in a relational database and it is multi-user .
    Downloads: 0 This Week
    Last Update:
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  • 10
    This software system serves as both a DICOM image viewer as well as a diagramming tool for collaborating notes on the given image sets. This my Computer Science graduate thesis project at Loyola Marymount University.
    Downloads: 0 This Week
    Last Update:
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