Axure RP is a wireframing, rapid prototyping, documentation and specification software tool aimed at web and desktop applications.

Creately is a collaborative diagramming and design software used by teams around the world to communicate more effectively.

draw.io is free online diagram software for making flowcharts, process diagrams, etc

Diagramo is an online flowchart software. It's FREE and Open Source ( GPL ) It's pure HTML5 Share and collaborate.

Enterprise Architect is a visual modeling and design tool based on the OMG UML.

Gliffy is software for diagramming via a HTML5 cloud-based app. It is used to create UML diagrams, floor plans, Venn diagrams, flowcharts and various other ki…

ConceptDraw PRO is diagramming software used to create business graphics, including ConceptDraw Flowcharting Suite.

Dia is free and open source drawing software.

Diagrammix is a tool for efficiently building attractive diagrams and flowcharts.

Edraw Max is comprehensive mind mapping and planning tool network diagrams, floor plans, workflow diagrams, business charts, and engineering diagrams.

Fluid UI is a browser-based wireframing and prototyping tool developed by Fluid Software and used to design mobile touch interfaces.

Google Drawings is a free, web-based diagramming software developed by Google.