Many of my training classes mention this list of the various Dynamics CRM SDKs so I thought I would post it here for safe-keeping.
Dynamics CRM 2011: http://www.microsoft.com/download/details.aspx?id=24004
Dynamics CRM 2013: http://www.microsoft.com/download/details.aspx?id=40321
Dynamics CRM 2015: http://www.microsoft.com/download/details.aspx?id=44567
Dynamics CRM 2016: https://www.microsoft.com/download/details.aspx?id=50032
Dynamics 365: https://www.microsoft.com/en-us/download/details.aspx?id=50032
** this is the same as the 2016 SDK
