Freelancer Stack - Curated directory of tools used by 10,000+ freelancers
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Hourly - Find out how much you should charge per hour
MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.
The Standard Freelance Contract - The first common standard service agreement
fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!