MacPorts!

Chocolatey 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.In terms of updates, it allows you to update nearly everything on your machine with a few simple keystrokes.

Synaptic is a graphical package management program for apt. It provides the same features as the apt-get command line utility with a GUI front-end based on Gtk+.

Homebrew-cask provides a friendly homebrew-style CLI workflow for the administration of Mac applications distributed as binaries.

The Mac App Store is the best place to find apps for Mac. No more boxes, no more disks, no more time-consuming installation. Just like the App Store for iPhone and iPad, click once to download and install any app on your Mac.

Apt (for Advanced Package Tool) is a set of core tools inside Debian.

One of the great things about using open source software is the frequency with which bugs are fixed, security holes are patched, and new features are added. Ubuntu includes a very convenient update manager, which checks the software repositories for updates, and alerts you to install any new versions found. However, if you are annoyed at constantly upgrading, you can follow this guide to tweak the settings of the manager: Navigate to the Software Sources control panel. Under your “System” menu, select “Administration”, and select “Software Sources.” You will be prompted for your root password; once the window opens, select the “Updates” tab: »

App Grid is a new lightweight Ubuntu Software Center alternative that tries to make application discovery easier by using a grid view which includes app screenshots and ratings.

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. It provides atomic upgrades and rollbacks, side-by-side installation of multiple versions of a package, multi-user package management and easy setup of build environments.

Cakebrew is the most convenient way to use Homebrew for your daily tasks! It does for Homebrew what Synaptics does to Linux package managers. From the Cakebrew UI, you can:

What is Fink?

Ubuntu Sources List Generator is a website where you can generate a sources.list file with a lot of useful repositories.

win-get is an installer and software repository for Microsoft Windows, like apt-get in Linux.