The Stream .NET SDK by Stream communicates with the API to access data related to activity streams and news feeds. It contains installation with NuGet and usage. Documentation available at http://getstream.io/docs/
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.