yEd is a product of yWorks, a diagramming component software manufacturer. I had been looking for a good alternative for Microsoft Visio to use on my Debian box.
Enter yEd. I must commend the yWorks team. The tool is extra easy to install and it just works out of the box.
1) Download the installation file from yWorks website: go to their downloads page http://www.yworks.com/downloads and scroll down to the tools and applications section.
Download the installer file for your 32-bit / 64-bit version of Linux.
2) Place the installer file in your intended installation directory, change the permissions of the file and run the file.
command to change file permission: chmod +x <filename>.sh
command to run the installer: sh ./ <filename>.sh
Click Next to begin the installation: accept the agreement and all other defaults.