Peek-a-week - Look back at your week to see if you were productive

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

CoinMarketSum - Cryptocurrency and ICO market coverage dashboard.

SheetBest - Turn a Google SpreadSheet into a JSON Database API

Tradefluence - Tradefluence is a dual-sided marketplace that pairs retail traders with financial influencers seeking to sell their market insights.

Sheetsu - Turn Google Spreadsheet into API