Stripe Billing - A set of tools for billing and subscriptions
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
ServiceBot - The new, open source way to run a business online. Subscription billing, Self-service customer portal, service lifecycle management?
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Apple Numbers - Numbers lets you build beautiful spreadsheets on a Mac, iPad, or iPhone — or on a PC using iWork for iCloud. And it’s compatible with Apple Pencil.