Zoho Invoice - 100% free online invoicing software for small businesses.
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Monzia - Monzia can help you save money, relieve stress and make time for the fun things in life.
fusebill - Fusebill is the leading recurring billing and subscription management software for businesses. Try Fusebill for subscription billing made easy!
Kamerge - Kamerge simplifies & systemizes the key processes of your business.
Elorus - A super-easy online invoicing & time tracking software