Dpkg

free software package management system

Gtk GUI front end for APT

dpkg is the software at the base of the package management system in the free operating system Debian and its many derivatives. dpkg is used to install, remove, and provide information about .deb packages.

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Cydia is a graphical user interface of APT for iOS. It enables a user to find and install software unauthorized by Apple on jailbroken iPhones, iPads and iPod Touch devices. It also refers to the digital distribution platform for software on iOS accessed through Cydia software. Most of the software packages available through Cydia are free of charge, although some require purchasing.

Debian software package format

text front end for APT

project to port and package open-source Unix software to macOS

software utility for performing system-wide configuration tasks on Unix-like operating systems