Visual Paradigm Community Edition - A Free UML Tool. Free UML software for visual modeling with UML 2.x diagrams. Design API with the Class Diagram tool. With no redundant widgets on the screen, you can design freely in a large diagram editor. UML software with ERD tool for database design. The classical design of any automated process is UML diagrams that provide wide graphical ways to present all aspects of automation. Solution RapidUML from Software Development area of ConceptDraw Solution Park provides templates, examples and 13 vector stencils libraries for drawing all types of UML 1.x and 2.x diagrams using ConceptDraw DIAGRAM diagramming and vector drawing software. Free UML Software Online, Right Here! Visual Paradigm Online is a UML software designed for everyone. This software is good for people who want to jump right in drawing UML diagrams rather than spending tons of time trying to learn the software. You can create shapes with drag-and-drop, align and layout shapes precisely with alignment guide. Free: Windows, Linux, Mac. My Recommendation for Software Ideas Modeler. UML Designer is compatible with the free UML to Java code generator for Eclipse.
Open source UML tools for MAC OS X
BOUML
BOUML is a free UML 2 tool box allowing you to specify and generate code in C++, Java, Idl, Php and Python. (GPL)
Linux - FreeBSD - Windows - MAC OS X
Gaphor
Gaphor is a UML, SysML, RAAML, and C4 modeling application written in Python. It is designed to be easy to use, while still being powerful. Gaphor implements a fully-compliant UML 2 data model, so it is much more than a picture drawing tool. You can use Gaphor to quickly visualize different aspects of a system as well as create complete, highly complex models. (Apache)
Linux - Windows - MAC OS X
Modelio
Modelio is an open source modeling environment. Modelio delivers a broad-focused range of standards-based functionalities for software developers, analysts, designers, business architects and system architects. (GPL)
Cross-platform
Papyrus
Papyrus is aiming at providing an integrated and user-consumable environment for editing any kind of EMF model and particularly supporting UML and related modeling languages such as SysML and MARTE. (EPL)
Cross-platform
UML Designer
UML Designer provides a set of common diagrams to work with UML 2.5 models. The intent is to provide an easy way to make the transition from UML to domain specific modeling. (EPL)
Cross-platform
Umple
Umple is technology for Model-Oriented Programming. It adds abstractions such as UML associations, attributes, and state machines to object-oriented programming languages such as Java, PHP and Ruby. (MIT)
Cross-platform
Free Uml Editor
6 applications
UML Diagram or Unified Modeling Language Diagram is a collection of diagrams to help you visualize a software program. Thus, these diagrams are a combination of activities and action sequences that focus on time period specific processes. We suggest these great free UML diagram tools to help you make use of UML diagrams for your convenience.
Best Free Online UML diagram tools
GitMind
Score: 4.8 / 5
Pricing: Free
Download UML ExamplesTransform simple ideas into comprehensive and interactive content. GitMind is an excellent online platform where you can create different diagrams including UML for free. Using this as your daily UML diagram creator gives you access to customizable templates that are also available to help you make UML diagrams quickly and simply. Moreover, it has a friendly user interface that displays editing features for a hassle-free editing experience.
DOWNLOADVisual Paradigm
Score: 4.1 / 5
Pricing: Free; $4 for a starter plan; $9 for advanced
Another intuitive and powerful UML diagram software is Visual Paradigm. You can save time and effort by choosing from one of its built-in temples to get started. Another interesting feature is that it shows you the editing components whenever you hover over the interface.
Violet UML editor
Score: 4.2 / 5
Pricing: Free
Violet UML Editor is another UML diagram tool that is very easy to learn and to use. It is a cross-platform tool intended for students, developers, and authors who need to make UML diagrams quickly. The good thing about this tool is that it is a portable program that you can copy to your flash drive or any device, so you may take it with you whenever you need to create diagrams without any complicated installation process.
Software Ideas Modeler
Free Uml Software Mac Os
Score: 4 / 5
Pricing: Free; starts at $68
The next UML diagram software worth using is Software Ideas Modeler. This features quick and easy drawing tools to help create documents such as PDF and RTF, designing and styling options, Source Code Generation like C++, Java, and more. Moreover, depending on the template you’ve selected, you can insert images and any other objects to your diagram. Just simple drag and drop them in the editing area.
UMLet 14.3
Score: 3.8 / 5
Pricing: Free
The list of UML diagram tools is not complete without UMLet 14.3. This is an open-source built-in application for Windows that will help you make UML Diagrams for free. Its main features include built-in temples, and it allows you to build a sequence and a diagram of your activities from plain text. Meanwhile, it supports exporting different file types like eps, pdf, jpg, SVG, and clipboard.
ConceptDraw Diagram
Score: 4.6 / 5
Pricing: Free
ConceptDraw Diagram is an impressive UML diagram creator accessible on both Windows and Mac. This awesome tool is well suited for UML diagrams as it offers a number of solutions with vector stencils and templates for any project you need. Another good thing about this tool is that you can use GIF images to have an animated slide on your drawing for technical purposes.
Visio
Score: 4.8 / 5
Pricing: Free; $13/ month, $299 for standard, and $589.99 for Professional
Visio is a professional UML diagram software you may use in creating UML diagrams. It offers templates and modern UI. Thus, this feature can bring your diagrams to life with data icons, overlays, graphics, and colors for better visualizations.
Best Free Uml Tool Mac
Umbrello
Score: 43.7 / 5
Pricing: Free
Umbrello allows you to create diagrams in a standard composition to document or design format. Similar to other UML diagram tools, it supports sequence diagrams to help you show the order of the interaction and how the operations are carried out. Moreover, it also supports a number of code generators such as ActionScript, Java, Javascript, Pascal, etc.
Conclusion
These are the best free online UML diagram tools available. Each tool offers its own unique features for you to choose from. Meanwhile, if you are looking for the easiest and a totally free tool, GitMind is the best for you.