Software download list

XrmToolBox:
This piece of software is 100% need-to-have, and every Dynamics365/CRM developer should have this installed.
https://www.xrmtoolbox.com/

Dynamics 365 Storage analyzer:
Storage Analyzer Add-on

KingswaySoft:
SISS Integration Toolkit for Microsoft Dynamics 365
SSIS Productivity Pack

Visual Studio:
Community Edition 2019
Community Edition 2017

*UPDATE*:
I recently had some issues finding links to older versions of Visual Studio, but they can be downloaded free, when you log into https://my.visualstudio.com/. On the site, enter the Download page, and type in Community in the search bar. That will show you download links to current and previous versions of Visual Studio Community.

SQL Server Data Tools:
SSDT for Visual Studio 2017 (15.9.0) *New*
SSDT for Visual Studio 2017 (15.8.0)
SSDT for Visual Studio 2017 (15.7.1)
SSDT for Visual Studio 2017 (15.6.0)
SSDT for Visual Studio 2017 (15.5.0)
SSDTBI for Visual Studio 2015 (14.0.61021.0)
SSDTBI for Visual Studio 2013
SSDTBI for Visual Studio 2012
SSDT for Visual Studio 2012
SSIS Balanced Data Distributor 2008
SSIS Balanced Data Distributor 2012

.NET Framework:
dotNET Framework 4.7.2
dotNET Framework 4.7.1

Dynamics CRM for Outlook client:
Microsoft Dynamics 365 for Microsoft Outlook *HOTFIX* (8.2.2 – requires v8.2.0)
Microsoft Dynamics CRM 2016/Dynamics 365 for Microsoft Outlook 
Microsoft Dynamics CRM 2015 for Microsoft Outlook

** Updated 21/02-2019 10:00 UTC+1 **