Nektony Mac Visio Viewer Alternatives

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

Graphity is a diagram editor that can be used to quickly and effectively generate drawings and to...

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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.

Online diagramming application

Open Source

GeneVenn is an online diagram editor that allows the users to enter the list and may use the text area in order to assign letters on the list in the diagram.

Oqto Diagram is a powerful diagram creation and editing software that allows the users to make drawing on tablets and smartphones.

UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.

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

Open Source

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

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.

Choose from a wide variety of shapes to create diagrams and charts. Free from Google.

ArgoUML, free and safe download. ArgoUML latest version: Open-source diagramming application for personal computers. ArgoUML is a program that allows users to create complex and professional diagrams.

UMLet - Free UML Tool for Fast UML Diagrams