Apps similar to Astah UML include Lucidchart, which has a free version. Other options are PlantUML, Visual Paradigm, Umbrello and StarUML. UML Modeling Tools like Astah UML are a crowded field, with more than 25 alternatives for Windows, Linux, Mac, the web and Android.
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.
GenMyModel is an online modeling plateforme for UML, BPMN2, Database, Flowchart and more. It supports realtime collaboration, centralized model repository, versioning and full traceability.
France
EU
Dont lose the advantage of clarity and simplicity to an overly complicated tool - the Poseidon for UML software line lets you get down to work without entanglements in your development environment. Powerful features such as round trip engineering and documentation generation...
The Model Development Tools (MDT) project focuses on big "M" modeling within the Modeling project. Its purpose is twofold:
Whether you are a Business Architect, System Architect, Developer, Analyst or Designer, Modeliosoft meets your needs through its high quality solutions for modeling, and report, architecture or code generation.
UModel is a UML (Unified Modeling Language) software modeling tool from Altova, the creator of XMLSpy. UModel supports all 14 UML 2 diagram types and adds a unique diagram for modeling XML Schemas in UML.
AustriaEU
ckwnc is a uml sequence diagram creation tool that uses an intuitive c-style language to automatically create uml diagrams that can be saved as an image or embedded directly into other pages
RadDiagram offers flexible and interactive diagramming layouts for your rich data-visualization applications. The framework tool set enables you to:
United States
All-in-one modeling tool for UML, ERD, DFD and flowcharts, with built-in AI features (AI Chat Copilot, AI-Powered Code Reverse and an MCP server).
Japan
Inwardis keeps what you know about a system as a hierarchical model rather than separate diagrams. Every element can contain sub-elements, so a person or an AI agent opens one level, sees what matters there and drills into a single branch.
EstoniaEU
Archium is an interactive architecture model of your system created automatically from your distributed tracing data.
United Kingdom
