The Google Face Detection C# Sample Code by Google Vision presents how to integrate face recognition into web services and mobile applications. Resources include how to guides, authentication, and reference.
Amazon has largely rewritten its AWS SDK for Java. Although it is a rewrite from 1.11.x, Amazon used the same JVM so that developers don't have to migrate an entire product over to 2.x. Amazon focused on consistency, immutability, and ease of use in the rewrite. 2.x includes many requested features.