Here is the GUI screen shot

Steps to install.
just check out the code from net
#svn co svn+http://code.google.com/p/packetsquare-capedit/source/browse/#svn/branches/0.0.1
#cd svn/branches/0.0.1/
#make
If you get any gtk+2 not installed issue then install gtk libs.
In ubuntu simply run below command
apt-get install libgtk2.0-dev
After successful installation, install capedit tool.
Once compiled you can run tool by simply typing below command.
./capedit
This tool is very usefull when your are working with protocol stacks...
Ok, just dig and explore more. Happy crafting packets :)