blockdiag might be a bit more popular than NClass. We know about 1 link to it since March 2021 and only 1 link to NClass. 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.
Yet, there are plenty great tools for UML diagrams: StarUML, NClass, PlantUML and plenty others. Source: almost 2 years ago
I am trying to find an extension which will allow for markdown cells to have "markdown style" graph code (like mermaid, GraphViz or blockdiag) to be placed into them and then converted to an actual graph when the code is executed. I have been searching and have only found jupyter connections for python code, an outdated mermaid extension for jupyterhub and a nonfunctional GraphViz extension for jupyterlab. Are... Source: about 3 years ago
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.
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
draw.io - Online diagramming application
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.
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.