PlantUML Alternatives

Online diagramming application

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.

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 is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.

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

Simplify and communicate complex information using data-linked diagrams.

StarUML

Looking for an affordable software with Enterprise Architecture tool, PMBOK tool, UML tool, Agile tool, BPMN tool and UX tool? Read this page for details.

Draw, LibreOffice, ODF, open standards, creative software, vector drawing

Graphviz is open source graph visualization software. It has several main graph layout programs.

XMind is a brainstorming and mind mapping application.

UMLet - Free UML Tool for Fast UML Diagrams