Gliffy – Online Diagram And Flow Chat Software
Gliffy is an online free service that lets you create wireframing application, diagrams and flowchart, this tool is completely web-based and runs on any browser on a Mac OS X or Windows operating system.
Using this tool you can create effective presentations, it has a very simple and easy to use interface that makes the entire process of creating professional looking diagrams an enjoyable experience.

Using this tool you can create the following kind of useful diagrams:
* Flowcharts
* UML class diagrams
* Business process diagrams
* Venn diagrams
* Network diagrams
* Floor plans
* Website mockups and maps
* Class diagrams
* Org charts
* SWOT analysis
* UI wireframes
Gliffy comes in three flavors: a basic (free) account, a premium version and a customizable premium version.
Features:
• The service comes with an extensive selection of flowcharts that can be made with this application, including data flow diagrams, mind maps and organization charts.
• There is a collection of shapes that can be used to create each diagram, using a drag and drop feature.
• Using this tool you can share your diagrams with the others as well.
• Collaboration is the highlight of this tool, a team of users can collaborate and work on the diagrams and make all the necessary changes required.
• A plus point with this tool is that it works perfectly on both Windows and Mac

I have my own small IT company and have
been using Network Diagram Software
for a while now. The program is comprehensive and reliable. I would recommend
anyone in this field to try it out and see how easy it is to use.