UProc for Sheets - Boost your sales, marketing and IT tasks from Google Sheets
Mock API Generator - Generate custom data & API to build apps in less than 30s
Sheetlist - Discover free Google Sheets for marketing, finance and more
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
Mattermark in Salesforce AppExchange - Automatically enrich leads in Salesforce with Mattermark
Losant Kiln - The fastest way to build APIs for IoT applications