Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.

Stripe Billing Customer Portal - Stripe-hosted page for customers to manage subscriptions

Sheets by Google - Excel powered with automation and collaboration features.

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.

Airportal - Instant customer portals from your Airtable base

Recurpay - Recurpay is a subscription SaaS app for businesses that automates recurring billing.