The repositories contain software to make things easier to handle, f.i.:

Several tasks for textworking.
The automated Mail and News exchange.
It is possible to pipe the mailtraffic over a GPGswitch which will automatically sended Mail encrypt and arrived Mail decrypt.
Managing of a Cloud.
There are new filters for image conversation.
A new script for managing the BZFlag Server. It makes it easy to switch the server to different configurated maps.
Counter for Web-Pages.
The MP3-Player JOMP in a version for the CLI an in a version for the GUI.
Commands to rip CDs/DVDs, to create MP3s of them and to create and embedd ID3-Tags.
Commands to work on Multimedia files and Streams.
Some simple programs for financial Calculations.
A simple program to manage terms.
Utilities to manage PDFs.

There are several commands and libraries which provide new commands and functions. The listing above gives only a little hint of the possibilities.

Use yast or zypper to access the repositories.