NetworkManager is a system network service that manages your network devices and connections, attempting to keep active network connectivity when available. It manages ethernet, Wi-Fi, mobile broadband (WWAN), and PPPoE devices, and provides VPN integration with a variety of different VPN services.

Twine is a tool for uploading distributions (in the Python meaning) to PyPi.

IBus is an Intelligent Input Bus. It is a new input framework for Linux OS. It provides full featured and user friendly input method user interface. It also may help developers to develop input method easily.

RabbitMQ is an implementation of AMQP, the emerging standard for high performance enterprise messaging. The RabbitMQ server is a robust and scalable implementation of an AMQP broker.

'grep' is a utility to search for text in files; it can be used from the command line or in scripts. Even if you don't want to use it, other packages on your system probably will.

The Uno Runtime Environment (URE) is the well-known UNO component model of LibreOffice, packaged up as an individual product.