Stable Version

KDE 3

The latest stable release for KDE 3.1 is 0.7.2. It's included in the kdenetwork package of KDE 3.1. You can get binary and source packages at kde.org.

KDE 2

The latest stable release for KDE 2.2 is 0.6.1. It's included in the kdenetwork package of KDE 2.2.2. You can get binary and source packages at kde.org.

KDE 1

The latest stable release for KDE1 is 0.1.13.
You can get the source here.