Algo by AirDev - Turn a Google Sheet model into a web app in 5 minutes

Digit - SMS bot that monitors your bank account & saves you money

SpreadShare - Explore community-curated spreadsheets.

Quicken - Stay in control of your monthly cash flows, budgets, and expenditures. Quicken provides a navigable interface where you can organize your debit, credit, and savings, and build good habits accordingly.

Sheetsu - Turn Google Spreadsheet into API

Penny - Penny is a personal finance app that takes the pain out of keeping track of your finances.