apt-get repositories
In addition to the official Debian GNU/Linux package archives there are several well known unofficial repositories from which you can download and install packages.
Three of the best known archives are:
The first two offer more recent packages than those available with the Sarge release of Debian GNU/Linux, whilst the latter offers multi-media packages which aren't included with Debians releases.
Personal APT Repository
For my own use I maintain a small personal repository which can be used by apt-get.
This mostly includes softawre I have written, or found a need for, which isn't included in Sarge.
For details, and contents, please consult: