Qualys SSL Labs .NET Library by Ashley Poole allows developers to test SSL servers on the public internet. This SDK helps developers to interact with the Qualys SSL Labs Assessment API from their application, using .Net.
The Signinghub API helps accomplish something that looks simple (see image below) but is tricky to do securely: digitally sign a document. The API, using REST-based web services with XML responses, makes its possible to incorporate digital signing into your application that is based on the Public Key Infrastructure.
AWS has introduced Secure Packager and Encoder Key Exchange (SPEKE). SPEKE is an API specification that aims to standardize integration of DRMs with encoders, transcoders, and encryptors. Prior to SPEKE, such communication was done on a one-off basis, with a custom API between DRM and encryptor.