You can find the most used resources in this post. There are also more resource if you know please specify in comments.
Also you can find all resources on Guido Preite’s blog for all version.
Microsoft Dynamics CRM 2015 Software Development Kit (CRM 2015 SDK)
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=44567
CRM Help & Training
https://www.microsoft.com/en-US/dynamics/crm-customer-center/
CRM eBooks and Videos
https://www.microsoft.com/en-US/dynamics/crm-customer-center/ebooks-and-videos.aspx
Microsoft Dynamics CRM 2015 Update 1 (KB 3056327)
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=46908
Microsoft Dynamics CRM 2015 Update 0.1 (KB 3010990)
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=46552
Microsoft Dynamics CRM 2015 for Microsoft Office Outlook (Outlook Client)
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=45015
XrmToolbox for Dynamics CRM 2013/2015
Microsoft System Center Management Pack for Dynamics CRM 2015
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=46371
Microsoft Dynamics CRM 2015 E-mail Router
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=45017
Microsoft Dynamics CRM 2015 Custom Code Validation Tool
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=45535
Windows Identity Foundation for Windows 7, 2008, 2008 R2, and Vista
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=17331
Microsoft Dynamics Marketing SDK
Download link: https://www.microsoft.com/en-us/download/details.aspx?id=45023
Microsoft Dynamics Marketing 2015 Resources
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=43108
Microsoft Dynamics CRM 2015 Report Authoring Extension (CRM 2015 BIDS)
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=45013
Microsoft Dynamics CRM 2015 List Component for Microsoft SharePoint Server 2010
and Microsoft SharePoint Server 2013 (for multiple browsers)
Download link: http://www.microsoft.com/en-us/download/details.aspx?id=45018
The link to XrmToolBox is not clickable, and is not correct.
Correct URL is http://www.xrmtoolbox.com 🙂
Thank you for the information Jonas 🙂 I updated.
Resource Web JScript is fun:
http://social.technet.microsoft.com/wiki/contents/articles/12950.crm-2011-thoughts-and-overview-of-useful-jscript-libraries.aspx