The best free UML Modeling alternative to Lucidchart is LibreOffice - Draw, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Lucidchart and six of them are free UML Modeling Tools so hopefully you can find a suitable replacement. Other interesting free UML Modeling Tool alternatives to Lucidchart are yEd Graph Editor, PlantUML, Gaphor and ProcessOn.
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.
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...
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.
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.
ProcessOn is a free online drawing tool that supports the creation of mind maps, flow charts, swimlane diagrams, network topology diagrams, fishbone diagrams, UML and other graphics.
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.
More affordable alternative with similar features.
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It's an online diagramming platform similar to Lucidchart that can create many kinds of diagrams. You can use most of its functions for free.