KAlarm is part of the KDE project http://www.kde.org/.

KAlarm can be found in the kdepim package on ftp://ftp.kde.org/pub/kde/, the main FTP site of the KDE project.

KAlarm is also available as a standalone package for KDE 4, as well as older versions for KDE 3 and KDE 2, from http://www.astrojar.org.uk/kalarm