Hi,

I was passing by your site coming from dotproject, and since i use vtigerCRM, i must say that you are right as to vtiger being based on the code of SugarCRM.
I must say that i also like SugarCRM, and also tried it.
The problem with SugarCRM if you see their projects for the future Open Source versions they will have limited features, i guess they are using their OS to sell the commercial version, and that's fine by me but gives me little hope as to it's future in Open Source.
vtigers team pick up a version of SugarCRM with a license that grant's them the right's to change the source in order to continue to add real value to SugarCRM tool and making it feature rich.
If you try the demo or visit their site in www.vtiger.com, you will notice that SugarCRM appears always as the base code for the tool, so proper credit is given to SugarCRM, and i think that is the right way to do it and even mandatory.

So many thanks for your time on reading my comment, i hope it clarifies things.