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.
RevOps - Building blocks for better sales agreements
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Massdriver - Massdriver makes DevOps effortless, allowing engineers to quickly deploy secure, production-ready infrastructure using a simple diagramming interface.
fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!
MicroAcquire - A free & anonymous startup acquisition marketplace