Apps similar to PlantUML include draw.io, which is free and open source. Other options are Excalidraw, yEd Graph Editor, Dia and Freeplane. You're spoiled for choice with Diagram Editors like PlantUML: we list more than 100 alternatives for Windows, the web, Mac, Linux and self-hosting.
blockdiag and its family generate diagram images from simply text file.
Features:
Supports many types of diagrams block diagram (w/ blockdiag) sequence diagram (w/ seqdiag) activity diagram (w/ actdiag) logical network diagra.
Japan
ClassBuilder is freeware CASE tool targeted at the C++ developer, running on Win2K-XP. It lets you create, manipulate and navigate classes, class relations, class members and class methods at a high level of abstraction through a graphical user interface.
Mark makes drawing flowcharts and diagrams as easy as drawing with a pencil. It automatically converts shapes and text as you draw with Apple Pencil.
United States
ARIS Express is based on the proven ARIS methodology and industry standards. Its intuitive user interface and the latest improvements in modeling assistances enable instant results. This free version will appeal to universities and vocational schools, as well as BPM beginners...
Germany
EU
NClass is a free tool to easily create UML class diagrams with full C# and Java language support. The user interface is designed to be simple and user-friendly for easy and fast development. Properties, enums, delegates and other language specific elements are fully supported...
HungaryEU
A lightweight HTML5/javascript library for UML 2 diagramming.
Alpha software. This project is in progress. Many functionalities are ready to be used. Nevertheless, some features and developments will not be neccessarily available for download.
Simple vector graphics editor for creating flowcharts, UML class diagrams, illustrations and slide shows.
DenmarkEU
Aspose.Diagram is a .NET Visio Diagramming component that allows working with VSD, VSS, VST, VSX, VTX, CDW and VDX files on Mono, C#, VB.NET, ASP.NET web applications, web services and Windows applications. It enables developers to work with VSD & VDX files on ASP.
OCLE is a UML CASE Tool offering full OCL support both at the UML metamodel and model level.
RomaniaEU
Generate diagram-rich reports and documents, instantly. Generate software architecture diagrams, network diagrams, UML diagrams, cloud diagrams and many more!
~ Simple way to view, annotate and share Microsoft Visio diagrams ~
United States
