Octokit.rb is a Ruby toolkit for the GitHub API. The package wraps the GitHub API in a flat client that follows Ruby conventions, making it easy for Ruby developers to implement without much knowledge of REST design. The client is well documented and has been tested. Supported Ruby versions include: Ruby 1.9.2, Ruby 1.9.3, Ruby 2.0.0, and Ruby 2.1.0.
Skyscanner is a travel search site that helps users find flight, hotel and car rental deals anywhere in the world. This has led to considerable growth in website traffic, but it is the free access the company provides to its APIs that is generating interest from travel startups.
When it comes to map mashups there's no doubt that Google Maps leads the way. On ProgrammableWeb we list 1,964 Google Maps mashups, almost four times as many as any other API. This popularity makes utilities built on top of Google Maps especially interesting, such as this contextual menu control, which pops up a menu when the user right clicks.