VOGSY - Professional service automation tool built on Google G Suite
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Office Timesheets - Professional Services Automation
Elorus - A super-easy online invoicing & time tracking software
TimeControl - TimeControl timesheet software that is fast to implement and easy to use to track time for finance, payroll, HR and Project Management.
MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.