ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.

QuickBooks - Business runs better with QuickBooks, the #1 accounting solution for small business.

fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!

FreshBooks - The ideal accounting software for small business owners.

MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.

Zoho Books - Smart Accounting for Growing Business