Since UML is a Unified Modeling Language, it is used to create meaningful, object-oriented models for a software application. It clearly represents the working of any hardware/ software system. There are numerous tools, both commercial and open-source, which are available for designing UML diagrams, are enlisted below:
StarUML is an open-source software modeling tool, which is provided by MKLab. It has come up with eleven different types of modeling diagrams. It also supports UML2.0 specified diagrams.
Download link: http://staruml.io
Download link: https://umbrello.kde.org
3. UML designer tool
The UML designer tool helps in modifying and envisioning UML2.5 models. It allows you to create all of the UML diagrams.
Download link: http://www.umldesigner.org/download/
Altova has provided UModel, which is another UML software modeling tool. It supports all types of 14 UML2 diagrams as well as SysML for the embedded systems. It also holds up for business process modeling for enterprise analysts. It generates visually designed software models by incorporating Java, C++, and C #or Visual Basic .NET.
Download link: https://www.altova.com/umodel
Umple is an object-oriented and modeling language that textually supports state diagrams and class diagrams. It adapts JAVA, C++, and PHP, which results in more readable and short lines of code.
Download link: https://cruise.eecs.uottawa.ca/umple/
6. Visual Paradigm
A visual Paradigm is a tool that supports SysML, UML2, and Business Process Modeling Notation from Object Management Group. It involves report generation as well as code generation.
Download link: https://www.visual-paradigm.com
Whitestar UML is a division of StarUML 5.0 that offers bug fixes and has improved its compatibility with the latest operating systems, i.e., support of Unicode strings or simply being developed and tested on Windows 7 and 8.
Download link: http://whitestaruml.sourceforge.net
Draw.io is an open-source modeling tool to create flowcharts, process diagrams, UML, ER, and network diagrams.
Download link: https://www.draw.io
GenMyModel is an online modeling platform that offers Business (Archimate, BPMN, flowcharts support) as well as IT modeling (RDS, UML2.5 class diagrams).
Download link: https://www.genmymodel.com
It is an online platform that offers UML tools for faster development of UML diagrams. It is based on UMLet, which is an eclipse plugin or work as a standalone tool.
Download link: http://www.umlet.com/umletino/umletino.html
Diagramo is an online open-source HTML5 software that allows you to build flowcharts. It allows easy download and installation on the servers.
Download link: http://diagramo.com
Astah, which was previously known as JUDE (Java and UML Developer's Environment) is a UML modeling tool.
Download link: http://astah.net
Download link: https://www.bouml.fr
ConceptDraw is a software, which is used in diagraming for creating business graphics that include diagrams, flowcharts, Infographics, data envisioning, data presentation, and project management documentation.
Download link: https://www.conceptdraw.com/products/drawing-tool
Dia is an open-source general-purpose drawing tool, which is licensed under GPL. It let you create flow charts, UML diagrams, network diagrams, circuit diagrams, and many more. It allows you to incorporate a subset of Scalable Vector Graphics (SVG) while writing a simple XML file for drawing new shapes.
Download link: http://dia-installer.de
Sparxsystems is a diagram designing tool that helps in visualizing, analyzing, modeling, testing, and maintain software, system, processes, and architectures. It builds a robust and maintainable software.
Download link: https://sparxsystems.com
Gliffy is an open-source software that designs UML diagrams, floor plans, Venn diagrams, flowcharts, and much more. It allows the user to share and edit Gliffy diagrams dynamically.
Download link: https://www.gliffy.com
Lucidchart is an HTML-5 based UML tool that allows user interaction while drawing, editing, and sharing diagrams and charts. With Lucidchart, you can create simple flowcharts as well as complex technical diagrams.
Download link: https://www.lucidchart.com/pages/
19. Magic Draw
Magic Draw is used to model UML diagrams, SysML, BPMN, and UPDM that supports the dynamic collaboration of the team. This tool is meant for business analysts, software analysts, programmers, and QA engineers. It facilitates analyzing and designing object-oriented systems and databases.
Download link: https://www.nomagic.com/products/magicdraw
Visio is a part of the Microsoft family, which is a diagramming software. It is helpful in drawing building plans, floor charts, data flow diagrams, process flow diagrams, business process modeling, swimlane diagrams, and many more.
Download link: https://products.office.com/en-in/visio/flowchart-software
Modelio is an open-source UML tool that amalgamates UML2 and BPMN standards to support an inclusive range of models and diagrams.
Download link: https://www.modelio.org
Nclass is an open-source tool, used to create class diagrams that support #C and Java. It requires a framework of .NET 4.0. It has designed a simple and user-friendly user interface for fast and easy development.
Download link: http://nclass.sourceforge.net
23. Open ModelSphere
Open ModelSphere, which is written in Java, is an open-source data, process, and UML modeling tool. It supports forward and reverse engineering.
Download link: http://www.modelsphere.com/org/
24. Systems design rhapsody
System design rhapsody provides a collaborative design and modeling environment, which is based on UML for creating real-time, embedded systems. It helps in managing complex issues such as product system development.
25. Reactive Blocks
A visual model-driven environment is based on the activity diagram that is supported by reactive blocks. Since it is a UML tool, it incorporates code generation, hierarchical modeling, and an extensive library of ready-to-use components for the Java platform.
Download link: http://www.bitreactive.com/reactive-blocks/
26. Software Ideas Modeler
Software Ideas Modeler is the CASE and designing tool written in C# that supports all of the 14 diagrams specified by UML2.5, SysML, ERD, Archimate, flowcharts, DFD, wire frames, user stories, and much more.
Download link: https://www.softwareideas.net