Violet UML Editor Alternatives

WhiteStarUML is a fork of StarUML with an intent to revive its Delphi code base by updating code to...

Eclipse Papyrus is an industrial-grade open source Model-Based Engineering tool. Eclipse Papyrus has notably been used successfuly in industrial projects and is the base platform for several industrial modeling tools.

Unimus is a Network Automation and Configuration management (NCM) solution designed for fast deployment network-wide and ease of use. Unimus does not require learning any abstraction or templating languages, and does not require any coding skills.

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StarUML

The ObjectAid UML Explorer is an agile and lightweight code visualization tool for the Eclipse IDE.

Online diagramming application

Open Source

UMLet - Free UML Tool for Fast UML Diagrams

Yuml.me is a legit modeling tool that comes with the strategic measure that let teams and individual create diagram more quickly via simply typing plain text.

The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.

System Designer is a low code development platform that you can use to create UML-based models.

UModel is a web-based tool that enables developers to use UML diagrams to express their software requirements.

SEQO generates UML sequence diagrams from a simple text.

Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.

A Powerful idea processor.It's Open Source and Freeware.