Recurring Billing Pro is self-hosted billing software for businesses that charge the same customers every month: gyms, clubs, associations, landlords and service businesses. It sends invoices and payment reminders automatically, takes online payments through Stripe, PayPal, Square and five other providers, and shows a color-coded grid of exactly who has paid for which month. You install it on your own server and pay once, with no monthly fees, and your customers' data never leaves your hosting. Agencies can white-label it with their own name, logo and colors.