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.

wpnetworkit

Cristiano Zanca

WooCommerce Booking Bundle Hours allows you to buy WooCommerce packages of time services, 
 use them from time to time and keep track of hours still available and hours already used.
more info here <a href="https://bookingbundles.com/doc/" rel="nofollow ugc">WooCommerce Booking Bundle Hours documentation</a>
<h3>Credits</h3>
<ul>
<li>Cristiano Zanca, Francesco Cozzi (idea), Parameshwar Roy (P. Roy)</li>
</ul>

Solutions Invoice Manager vs WooCommerce Booking Bundle Hours