Kubuntu is a free, user-friendly operating system based on the K Desktop Environment and on the award winning Ubuntu operating system. With a biannual release cycle and at least 18 months of free security updates for each release, it is the secure, stable computing environment you've been waiting for.
Office Suite: OpenOffice.org 3.0
Internet: Konqueror (web browser), Kopete (IM), Quassel (IRC), KTorrent
Multimedia: Amarok (audio), Dragon (video)
Email: Kontact (Personal Information Manager), KMail, KAddressBook, Akregator (RSS), KOrganizer (calendar)