CoApp is described as 'open-source package management system for Windows' and is an app in the OS & Utilities category. There are more than 10 alternatives to CoApp for a variety of platforms, including Linux, Windows, Online / Web-based, Windows S and Windows Phone. The best alternative is Chocolatey, which is both free and Open Source. Other great apps like CoApp are Synaptic (Free, Open Source), Npackd (Free, Open Source), Just Install (Free, Open Source) and Microsoft Store (Free).
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+. * Install, remove, upgrade and downgrade single and multiple packages. * Upgrade your whole system.
Npackd (pronounced "unpacked") is an application store/package manager/marketplace for applications for Windows. It helps you to find and install software, keep your system up-to-date and uninstall it if no longer necessary.
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.