Chocolatey is described as 'NuGet is a Machine Package Manager, somewhat like apt-get, but built with Windows in mind. It is built on top of NuGet command line and the NuGet infrastructure' and is a very popular Package Manager in the OS & Utilities category. There are more than 50 alternatives to Chocolatey for a variety of platforms, including Windows, Linux, Online / Web-based, Mac and BSD. The best alternative is scoop, which is both free and Open Source. Other great apps like Chocolatey are Ninite (Freemium), Homebrew (Free, Open Source), SUMo (Freemium) and Synaptic (Free, Open Source).
Zero Install is a decentralised cross-distribution software installation system. Other features include full support for shared libraries, sharing between users, and integration with native platform package managers.