Browse free open source UML tools and projects below. Use the toggles on the left to filter open source UML tools by OS, license, language, programming language, and project status.

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  • 1
    plantuml
    PlantUml allows to quickly create some UML diagram using a simple textual description language.
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    Downloads: 4,644 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: 60 This Week
    Last Update:
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  • 3

    Z Word Tools

    Write, check, index and diagram Z specifications in Microsoft Word.

    Tools to allow Z specifications to be written in Microsoft Word. Includes a unicode font for Z symbols. Provides: WYSIWYG editing fully integrated into Word; Typechecking using fuzz (for Spivey Z) or CZT (for ISO standard Z); Indexing and cross-referencing; Diagrams of specification structure; Conversion from Spivey to Standard Z- also available as a stand-alone program and Java class for non-windows users. See project website for details.
    Downloads: 21 This Week
    Last Update:
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  • 4
    Apricot DB

    Apricot DB

    Database ERD- design tool with Reverse Engineering

    Design/Reverse Engineer/Generate Scripts/Compare Versions of all major databases with "Apricot DB" ERD- tool "Apricot DB" is a database tool for design and analysis of the relational database structure. It represents the DB- structure in the form of editable Entity/Relationship Diagrams (ERD). "Apricot DB" allows to perform reverse engineering on the existing database, as well as to create a new database structure from scratch. Allows to generate the essential DDL- scripts for CREATE/DROP/DELETE- operations based on the current ERD. "Apricot DB" supports two popular ERD notations: the "Crow's Foot" and "IDEF1x". The databases supported by Apricot DB: Oracle; SQL Server; MySQL; MariaDB; PostgreSQL; DB2/DB2 LUW; H2; SQLite Your feedback is appreciated.
    Downloads: 10 This Week
    Last Update:
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  • 5
    FOML
    FOML is an expressive logic rule language that supports object modeling, analysis, and inference. It naturally supports model-level activities, such as constraints (extending UML diagrams), dynamic compositional modeling, analysis and reasoning about models, model testing, design pattern modeling, specification of Domain Specific Modeling Languages, and meta-modeling. FOML can reason about: 1. The model meta-data (meta-model level reasoning, or syntax reasoning) 2. Data level: reason about a model and its data (instance model, i.e., diagram) FOML is built as a semantic layer on top of PathLP - a compact logic rule language of guarded path expressions, an adaptation of a subset of F-logic.
    Downloads: 5 This Week
    Last Update:
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  • 6
    A multi-language IDE written entirely with C#.NET. My goals include giving developers a framework that will allow them to add new languages, provide diagramming services to support language modeling and visualization (eg UML Class Diagrams, etc).
    Downloads: 0 This Week
    Last Update:
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  • 7
    Green, an Eclipse plugin, is an advanced yet simple UML class-diagram tool, developed primarily for student use. It does live round-tripping, so it's easy to move between diagram and code views. It's extensible: users can define their own relations
    Downloads: 0 This Week
    Last Update:
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  • 8
    JointJS

    JointJS

    The HTML 5 JavaScript diagramming library

    JointJS is the open source HTML 5 JavaScript diagramming library. JointJS is a comprehensive framework for building fully interactive diagramming tools and application builders. JointJS makes it easy to create visual languages & tools of various kinds. The event-driven nature together with MVC architecture of JointJS makes it easy to plug-in any backend application. Whether you're creating a state machine builder, modeling tool, voice application designer, system monitoring tool, electronic circuits simulator, information system browser and editor, implementing a visual programming language or building a graph visualization with interaction, JointJS is the toolkit that makes your life easier.
    Downloads: 0 This Week
    Last Update:
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  • 9

    UMLetino

    Web-Based UML Diagram Tool

    UMLetino is a free online UML tool for fast UML diagrams. It runs in your browser, and does not require any installs. It is based on UMLet (which is available as stand-alone tool or Eclipse plugin), and shares its fast, text-based way of drawing UML sketches. Main features: install-free web app; support for many UML diagram types; simple, markup-based UML element modifications; png export.
    Downloads: 0 This Week
    Last Update:
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  • 10
    Takes in a simple text file and converts it into a UML diagram. Currently simple sequence diagrams are implemented. The diagramming space on Linux boxes isn't great and I wanted a way to quickly put together a sequence diagram.
    Downloads: 0 This Week
    Last Update:
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