I am looking for application which allow me to manage the startup programs in KDE. Just like BootUp-Manager in Ubuntu (Gnome).
In the KDE Control Center, a.k.a. System Settings, there is an "Autostart" module that will allow you to set programs to run when you log in to KDE. On my computer it's on the "Advanced" tab, but I think the layout varies somewhat from distro to distro.
If you want to mess with it at a lower level, the files to run on startup go in