NuGet - The NuGet Gallery is the central package repository for NuGet, the package manager for .NET.
PDQ Deploy - Deploy software quickly with PDQ Deploy. It's simple to install just about anything to multiple computers on your network.
CocoaPods - The Dependency Manager for iOS & Mac projects
Just Install - just-install - The stupid package installer for Windows.
Scoop - A command-line installer for Windows
Chocolatey - The sane way to manage software on Windows.