LetterNote - Fine Stationery, Art Prints, Accessories & Collectibles
Algo by AirDev - Turn a Google Sheet model into a web app in 5 minutes
Neonto - Visual tool for creating native iOS and Android UIs
SpreadShare - Explore community-curated spreadsheets.
Rainbow Pencils - Make rainbows whenever you sharpen.
Sheetsu - Turn Google Spreadsheet into API