SoX is the swiss army knife of sound processing.

This package includes the libgimp libraries, which are necessary to run GIMP and third-party GIMP plugins.

JSON-GLib is a library for parsing, generating and manipulating JavaScript Object Notation (JSON) data streams using the GLib type system. It allows manipulating JSON data types with a Document Object Model API. It also allows serializing and deserializing simple or complex GObjects to and from JSON data types.

D-Bus is a message bus, used for sending messages between applications. Conceptually, it fits somewhere in between raw sockets and CORBA in terms of complexity.