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.
Earth Class Mail - Cloud-based, secure virtual mail & address solutions.
MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.
Cadebill - Integrated telecom billing, BSS OSS, and convergent charging
Elorus - A super-easy online invoicing & time tracking software