Sheetsu - Turn Google Spreadsheet into API
SpreadSimple - A blazing-fast way to create and manage sites using Google Spreadsheets
Sheety - Turn any Google sheet into an API instantly, for free. Power websites, apps, or whatever you like, all from a spreadsheet. Changes to your spreadsheet update your API in realtime. Neat
SheetAside - Access your Google Sheets from where you are
Sheetson - Instantly turn any Google Sheet into RESTful API
The Data Visualisation Catalogue - Reference tool for data visualisation