The HotDocs Open SDK is a toolkit meant to enable you to more easily integrate your host applications (and other third-party applications such as databases) with HotDocs. The Open SDK is implemented in C# and can be utilized by any managed (.NET) application to simplify communication with HotDocs Cloud Services and/or HotDocs Server.
For more information on the components included with the HotDocs Open SDK, see the information provided at the Github HotDocs Open SDK pages.