ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
The Contractors Edge - Oilpatch contractor software.
MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.
iLogistics - Oil Production
fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!
Petroware - Petroware is an oil & gas software solution that provides features and tools like accounting & financial management, production management, land management and more.