Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Microsoft Bing Image Search API - The Bing Image Search API adds a host of image search features to your apps including trending images. Test the image API with our online demo.
Apinizer - Create, Secure and Publish your API in 21 seconds
BigML - BigML's goal is to create a machine learning service extremely easy to use and seamless to integrate.
WrapAPI - Build an API on top of any website
Scikit-learn - scikit-learn (formerly scikits.learn) is an open source machine learning library for the Python programming language.