Joist - Joist is a mobile application to manage estimates, invoicing and accounting for contractors.
XaitCPQ - XaitCPQ is an intelligent Sales Automation Software that gives the sales team productivity at their fingertips.
Estimates App - Quick Estimation & Invoicing App. iOS, Android, Windows & Online @ https://estimatesapp.com/
Conga CPQ - Conga CPQ is a cloud-based multi-channel sales management platform that is designed to help companies of all sizes turn their focus toward selling.
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
CloudSense - CPQ and order management native to Salesforce