NClass might be a bit more popular than Diagramo. We know about 1 link to it since March 2021 and only 1 link to Diagramo. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Dynamic Draw is portable and runs on Windows. Caligra, Diagramo or Umbrello for Linux. Source: about 3 years ago
Yet, there are plenty great tools for UML diagrams: StarUML, NClass, PlantUML and plenty others. Source: almost 2 years ago
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
draw.io - Online diagramming application
Yakindu Statechart Tools - Discover YAKINDU Statechart Tools – a free statechart tool for the specification and development based on the concept of state machines.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.