yEd is a great, free software only available for Mac and has been created by yWorks.

More about yEd

The program version is 3.5.0.2 and was updated on 18/06/2012. yEd is available for users with the operating system Mac OS X and prior versions, and it is available in different languages such as English and German.Since the software joined our selection of software and apps in 2012, it has managed to obtain 9,800 downloads, and last week it gained 3 downloads. yEd is a program that requires less storage than the average program. It's a software very heavily used in many countries such as Russian Federation, India, and Germany.