xdg-utils contains utilities for integrating applications with the desktop environment, regardless of which desktop environment is used.

GTK is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK is suitable for projects ranging from small one-off tools to complete application suites.

Cloud-init provides a framework and tool to configure and customize virtual machine instances for Infrastructure-as-a-Service (IaaS) clouds platforms. It can for example set a default locale and hostname, generate SSH private host keys, install SSH public keys for logging into a default account, set up ephemeral mount points, and run user-provided scripts.

This library provides APIs to interface with various system components such as the system journal, the system service manager, D-Bus and more.

pip is the Python package installer. It integrates with virtualenv, doesn't do partial installs, can save package state for replaying, can install from non-egg sources, and can install from version control repositories.

This is the GNU C compiler, a fairly portable optimizing compiler for C.