The best UML Modeling alternative to Lucidchart is LibreOffice - Draw, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Lucidchart and 12 are UML Modeling Tools so hopefully you can find a suitable replacement. Other interesting UML Modeling Tool alternatives to Lucidchart are yEd Graph Editor, PlantUML, Visual Paradigm and Gaphor.
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.
Germany
EU
yEd is a powerful diagram editor that can be used to quickly create diagrams manually or import external data for analysis and auto-magically arrange even large data sets by just pressing a button. You can use yEd to quickly create flow charts, BPMN and UML diagrams...
GermanyEU
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. The generator can be run anywhere within JVM and integrated with various application such as wiki, text editor, IDE, programming language, documentation generator, and others.
FranceEU
Visual Paradigm for UML (VP-UML) is a UML design tool and UML CASE tool designed to aid software development. VP-UML supports key modeling standards such as Unified Modeling Language (UML) 2.4, SysML, ERD, DFD, BPMN 2.0, ArchiMate 2.0, etc.
Hong Kong SAR China
Gaphor is a WYSIWYG (What You See Is What You Get) UML and SysML modeling environment easy to use that will help you create your applications.
NetherlandsEU
ProcessOn is One tool for diverse diagramming needs.Product capabilities are mainly divided into Mind Map,Flowchart,Whiteboard,Mermaid,Formula Editor.Most importantly, ProcessOn supports AI-powered graphing, empowering tools through intelligent AI.
Hong Kong SAR China
Web-based diagram platform offers real-time teamwork, 50+ diagram and mind mapping types, technical wireframing, smart objects, templates, version control, secure cloud storage, PDF export, collaboration tools, commenting, and integration for business and education use.
Australia
Astah UML is a UML modeling editor with a user-friendly interface. It allows for the creation of various UML 2.x diagrams and mindmaps. The software includes features such as auto-creation of class diagrams, customizable shortcut keys, and merging project files.
Japan
Cloud-based diagram creation platform hosting draw.io diagrams, featuring real-time collaboration in a shared workspace. Supports flowcharts, cloud architecture (AWS, Azure, GCP), UML, ER, network diagrams, seamless import/export, and modern, intuitive interface.
ConceptDraw DIAGRAM v14 is the only product that supports Visio legacy, runs on macOS and Windows, and is a perpetual license. Import/Export VDX, VSDX, VSSX and Import VSD, VSS files.
Ukraine
Arialine brings Mermaid diagrams and AI diagram generation to Slack. Teams design systems in Slack threads, but diagrams often live elsewhere, fall out of date, and lose the reasoning behind them.
Ukraine
A diagram editor for architecture, process and software diagrams. Runs in the browser or as a desktop app and saves diagrams as readable YAML.
PortugalEU
