The Python Foursquare V2 Library is a wrapper for version 2 of the Foursquare API. It provides automatic retrieves, full non-merchant endpoint coverage, full test coverage, useful exception classes, and multi support.
Last week I read an article written by Kin Lane's Lack of Pinterest API is a Lack of API Business Strategy. The article points out that Pinterest has been developing a public API since May 2011. Though there once was API documentation for Pinterest, the company has yet to officially make the Pinterest API available to the public.
Strutta provides a platform to "engage your audience and convert fans to customers." It does this by launching and managing contests, sweepstakes, coupons, promotions, and by providing the Strutta API. For example, Crate & Barrel ran a wedding contest to drive couples to set up their wedding registries at the company, and featured friends and families of the contestants voting on the results to generate increased customer involvement.