FreshBooks - The ideal accounting software for small business owners.
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Avaza - Beautiful Projects, Timesheets, Expenses, Quotes & Invoices for Small Businesses
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.
Moon Invoice - Free Invoice Generator App - Easy Invoicing Software - Fast Mobile Invoicing App
fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!