Pragma - The home base for Ethereum developers.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Telnyx SMS API - Build global text messaging right in your app
WrapAPI - Build an API on top of any website
Notif.me SDK - A Node.js lib to send all your transactional notifications
Apinizer - Create, Secure and Publish your API in 21 seconds