Twinkle Tray - Easily manage the brightness of your monitors in Windows from the system tray.
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Monitorian - Monitorian is a Windows desktop tool to adjust the brightness of multiple monitors with ease.
fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.