Full featured open source help desk solution

I am working with a startup that needs a full functioned self hosted solution and needs to be able to do:
minor sales automation
Paypal add in
help desk and ticketing
integration with email server
remote client access
development tasks

I know its asking much..

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Danny ChildIT ManagerCommented:
Spiceworks is going to come up, for sure...

but why do you want PayPal in a helpdesk tool?
Steven CarnahanNetwork ManagerCommented:
Your title is a bit misleading.  You ask for "Full featured open source help desk solution" and then list all kinds of other functions you want.  It sounds more like you want a "Full featured open source Small Business solution"

In order to achieve all that you are asking I think you are going to have to go with multiple sources.  For example: You could use https://freehelpdesk.org/ and http://www.fatfreecrm.com/ 

There are many open source programs to choose from and you really need to see what best fits your needs. I don't know of any one program that will provide all of what you are asking.

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