PlantUML

PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.

20 Alternatives To PlantUML

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Coggle

Coggle is a simple, beautiful, powerful way of structuring information.

Creately

Share. Reuse. Innovate.

Dia

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

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.
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Enterprise Architect

Enterprise Architect - UML Design Tools and UML CASE tools for software development | Sparx Systems
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Gephi

Gephi is an open-source software for visualizing and analyzing large networks graphs.
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Gliffy

Gliffy is a powerful HTML5 online diagram maker. Create a flow chart, network diagram, UML diagram, organizational chart or wireframe with ease.

Graphviz

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

Modelio

Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
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Pencil Project

Single-user mockup / wireframing / diagramming tool

Software Ideas Modeler

Lightweight, powerful, easy to use, UML tool
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StarUML

StarUML
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UMLet

UMLet - Free UML Tool for Fast UML Diagrams

Umbrello

Umbrello UML Modeller is a Unified Modelling Language diagram programme for KDE.
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Visio

Simplify and communicate complex information using data-linked diagrams.

Visual Paradigm

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.

XMind

XMind is a brainstorming and mind mapping application.
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yEd Graph Editor

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.