Dia

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

17 Alternatives To Dia

Creately

Share. Reuse. Innovate.
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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.
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Google Drive

Access and sync your files anywhere

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

PlantUML

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

WebSequenceDiagrams

WebSequenceDiagrams is a web-based application that allows the user to use a proprietary language to define sequence diagram.

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.