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

Solid Commerce - Solid Commerce is an eCommerce operations platform helping businesses to grow their marketplace sales.

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

eBay Enterprise - eBay Enterprise provides a variety of marketing, customer care, payment processing, fulfillment, fraud detection services.

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

Radial - Radial offers order management and store fulfillment solutions.