eBay4R is a Ruby wrapper for eBay's Web Services SOAP API. Has ease of use and small footprint. Instead of 40-50 line examples eBay gives you in C# and Java, with Ruby and eBay4R, examples are 5 lines or less.
A few months ago, ProgrammableWeb announced the release of Heroku’s Platform API, which allowed developers to integrate the Heroku platform with third party applications and services. Now, Heroku has launched a public beta for OAuth 2.0 support for the Platform API. OAuth 2.0 support allows developers to control service needs as opposed to offering full service access to all user accounts.
Lemon, mobile wallet app, announced the Lemon API as one component of the Lemonade Platform.Prior to API integration, Lemon users were required to snap photos of their receipts and cards to incorporate the data into the mobile wallet app.