solutionsbysteve

Solutions Invoice Manager is an all in one invoice management system. Create invoices for your customers and allow them to view them password protected on your site. There is also built in support for emailing customers with multiple templates including custom, payment reminders, services rendered, and more.
This plugin is free to use and comes with the GPLv2 or later license. With that said this plugin lives solely on donations. If there is no monetary value in coding this plugin than development will cease to exist. If you would like you can donate here or use the button below.
If you would like to make requests for specific features please feel free to do so at http://solutionsbysteve.com/contact/ Remember, these are simply requests and no guarantee that it will fit in to the scope of the plugin but will absolutely be taken into consideration.
Donations 
Please feel free to make feature requests with your donations. DO NOTE: these are simply requests and no guarantee that it will fit in to the scope of the plugin but will absolutely be taken into consideration. 
http://bit.ly/Donate-SolutionsInvoiceManager

Solutions Invoice Manager

Manage invoices on your very own wordpress installation. Supports emailing, PDF viewing and Reports.

wbcomdesigns

Varun Dubey

Activate EDD Service Extended from your Plugins page (require Easy Digital Downloads plugin) if required plug is not installed and activated, Easy Digital Download Service Extended will not get activated.

EDD Service Extended

Easy Digital Download Service Extended adds message section in the user dashboard for conversation.

Solutions Invoice Manager vs EDD Service Extended