RECOMMEND PHP Contact manager software for my server Know of an off the shelf program I can buy and install?

Does anyone know what software is available to buy/license and run on my dedicated server for contact management for a sales force?  Each sales person needs to manage their leads and status of easch  their leads, send email responders etc.  
Would like to buy something off the shelf..  Does anyone know of PHP web software available for that?  

I also am looking to offer a self-replicating website, so if there is a platform with that in it already.. that would be even better!

THANKS!


addtional:
 It would be great if there is an option so that the emails that are sent can be sent by our server logging into their personal email account and sending them (they would put their smtp login info into the back end.  This would make the emails come directly from them..
hagoogAsked:
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deisrobinsonCommented:
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hagoogAuthor Commented:
I am looking for a one-time payment to use the software on my server for my whole sales force.  Not with per user fees.. Is there anything like that?
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deisrobinsonCommented:
This is open-source meaning you don't have to pay for it. Download the open source version here and you can use it on your servers: http://www.sugarcrm.com/crm/download/sugar-suite.html

The community edition is fine.
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