Algo by AirDev - Turn a Google Sheet model into a web app in 5 minutes
PencilCase - Transform your designs into native iOS apps in a heartbeat.
SpreadShare - Explore community-curated spreadsheets.
Creo - Creo is a modern design tool for Mac which combines design and development.
Sheetsu - Turn Google Spreadsheet into API
Rainbow Pencils - Make rainbows whenever you sharpen.