GraphicsMagick provides a set of command-line applications to manipulate image files. It is a fork of the ImageMagick project and therefore offers a similar set of features, but puts a larger emphasis on stability.

GUPnP is an object-oriented open source framework for creating UPnP devices and control points, written in C using GObject and libsoup. The GUPnP API is intended to be easy to use, efficient and flexible.

GPSBabel converts waypoints, tracks, and routes from one format to another, whether that format is a common mapping format like Delorme, Streets and Trips, or even a serial upload or download to a GPS unit such as those from Garmin and Magellan.

DictionaryReader is a dictionary application that queries Dict servers in the internet to let you look up words. It's aimed to be lightweight and easy to use.

Fish is a shell geared towards interactive use. Its features are focused on user friendliness and discoverability. The language syntax is simple but incompatible with other shell languages.