The Google Custom Search .NET library by Google interacts with the search and customization functionalities of the API. It contains guides to setup with authentication and authorization, simple API example, web applications, and service accounts. Besides this .NET library can access custom search, additional APIs can be also supported with their respective documentation. A complete list: https://developers.google.com/api-client-library/dotnet/apis/
Purlem, personalized landing page and marketing service, has launched The Purlem API that gives developers access to most of Purlem's personalization features. Purlem was born out of frustration with the cost and complexity involved in pURL development. Now available through an API, Purlem has taken more barriers out of pURL creation and maintenance.
Decibel pitches itself as a leader in the music metadata space by citing a deeper and more accurate dataset than its competitors. The slick video (embedded below) on its site is quite convincing. Decibel claims to collect music metadata from all sources all over the world, including record labels and users, check it for accuracy, and compile it into the database. It’s ambitions are set high with the goal of creating an industry standard in music metadata, and why not? Someone’s got to do it!
Blekko is a search engine which uses both algorithms and human interaction for producing high quality search results. Currently serving more than 3 billion pages, Blekko sorts through spam, content farms, and sites containing malware in order to offer only real information to the end-user.