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

RevOps - Building blocks for better sales agreements

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

Massdriver - Massdriver makes DevOps effortless, allowing engineers to quickly deploy secure, production-ready infrastructure using a simple diagramming interface.

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

MicroAcquire - A free & anonymous startup acquisition marketplace