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.
Online diagramming application
Simplify and communicate complex information using data-linked diagrams.
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
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.
Gliffy is a powerful HTML5 online diagram maker. Create a flow chart, network diagram, UML diagram, organizational chart or wireframe with ease.
Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.
Professional digital design for Mac.
Instead of starting with a blank screen, SmartDraw gives you the exact template you need.
Balsamiq. Rapid, effective and fun wireframing software.