kio_gopher is a gopher kioslave. Kioslave is a kde technology that allows kde programs to access a given protocol. Gopher is an internet protocol similar to http with only text and links. That means you will get gopher:// support in Konqueror.
KInitiator is a dock application for the K Desktop Environment that can be used to manage links to applications, urls and files in general.
In opposite to the desktop, it is meant to manage a lot of them.