Ruby DevKit (2.0+)
Ruby Development Kit - https://github.com/oneclick/rubyinstaller/wiki/Development-Kit
The most powerful set of tools available to create your Windows installation experience. Free and Open Source since 2004!
SharpKeys is a utility that manages a Registry key that allows Windows to remap one key to any other key.
Chocolatey is your machine level NuGet repository. Think apt-get for Windows (executables/application packages), not library packages.
Tool for creating and exporting releases for software applications hosted on GitHub
Cake (C# Make) is a build automation system with a C# DSL to do things like compiling code, copy files/folders, running unit tests, compress files and build NuGet packages.