q-invoice.nl

This plugin allows you to easily create (proforma) invoices, quotes and order confirmations from entries submitted through Gravity Forms. The documents can be saved as draft for later editing or sent directly to your customers’ emailaddress.
A subscription for q-invoice.com is required.
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q-invoice connect for Gravity Forms

Connects your Gravity Forms forms to q-invoice for automatic invoicing.

getcost

The easies way to integrate your own form and to receive leads from your wordpress website directly in GetCost Leads.
You can get your pre-generated shortcode from the Settings | Leads screen of the application.
Shortcode example:
[getcost form=”0″ business=”0″ height=”660px”]

GetCost WP Plugin

Plugin integration to have a GetCost form integrated into your wordpress's website.

q-invoice connect for Gravity Forms vs GetCost WP Plugin