Profit First Calculator - Calculate business accounts using the Profit First method
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Belion - Track your time and calculate your profits.
fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!
FB ads budget calculator - Easily calculate your Facebook ads profit potential
MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.