Chocolatey - The sane way to manage software on Windows.
Ketarin - Ketarin is a small application which automatically updates and optionally installs setup packages...
Ninite - Ninite is the easiest way to install software.
MacPorts - The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system.
NuGet - The NuGet Gallery is the central package repository for NuGet, the package manager for .NET.
AppGet - Free and Opensource package manager for Windows