Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
BillGrid.com - BillGrid is an easy to use online invoicing, billing and expense management system that will save you time with tracking clients projects, expenses, invoices and payments.
Servetel - Communication management solution
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
LeadMaster - The LeadMaster LeadMasterCRM All-in-One solution includes: marketing automation, lead management, email marketing, website integration & much more.
Elorus - A super-easy online invoicing & time tracking software