The Citrix ShareFile PowerShell .NET SDK by Citrix allows developers to integrate the Citrix ShareFile API into their applications developed with Powershell and .NET. This SDK requires PowerShell 4.x and .NET 4.x.
Dropbox recently released v2 of its Team Events API. The Team Events API is part of Dropbox Business and allows users to track activity within Dropbox. The API has been completely rewritten from v1, and includes over 300 events that users can access through the activity log.