Integration Labs (formerly RootFi) - Securely access your business customers accounting, commerce and payments data with a single integration.
TrueLayer - Simple Bank APIs to access real-time financial data
Codat - Codat works with lenders, banks, insurers and software providers to provide integrations with the accounting and other financial softwares.
Hack Club Bank - Non-profit bank account for high school hackathons
Teller API - A single API to connect your app with any bank's account
Bendigo Banking App - Internet Banking. Designed for now.