Whimsical Alternatives

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Online diagramming application

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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.

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

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

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.

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

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.

StarUML

UMLet - Free UML Tool for Fast UML Diagrams

Gaphor is a Python-based, open source, multiplatform and multipurpose modeling application for creating nice UML diagrams for documentation.

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

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