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Client Invoicing by Sprout Invoices – Easy Estimates and Invoices for WordPress

Quotes Addon for GetPaid

Instant Estimate Calculator

WooCommerce Invoicing Payments w/ Sprout Invoices

Formidable Forms + Sprout Invoices – Easy Invoice & Estimate Submissions

Gravity Forms + Sprout Invoices – Easy Invoice & Estimate Submissions

Ninja Forms + Sprout Invoices – Easy Invoice & Estimate Submissions

WP Forms + Sprout Invoices – Easy Invoice & Quote Submissions

Quote Requests for WooCommerce

q-invoice connect for Gravity Forms

GetCost WP Plugin