Edubuntu
Edubuntu includes applications and games appropriate for children, and enables a teacher to setup a complete classroom quickly and easily.
Kubuntu
Kubuntu offers the KDE Plasma Workspace experience, a good-looking system for home and office use.
Lubuntu
Lubuntu is a fast, energy saving and lightweight variant of Ubuntu using LXDE. It is popular with PC and laptop users running on low-spec hardware.
Mythbuntu
Mythbuntu is a standalone MythTV based PVR system. It can be a standalone system or integrated with an existing MythTV network.
Ubuntu GNOME
Ubuntu GNOME uses GNOME Shell along with a plethora of applications from the GNOME Desktop Environment.
Ubuntu Kylin
The Ubuntu Kylin project is tuned to the needs of Chinese users, providing a thoughtful and elegant Chinese experience out-of-the-box.
Ubuntu MATE
Ubuntu MATE expresses the simplicity of a classic desktop environment. MATE is the continuation of the GNOME 2 desktop which was Ubuntu's default desktop until October 2010.
Ubuntu Studio
Ubuntu Studio is a multimedia content creation flavor of Ubuntu, aimed at the audio, video and graphic enthusiast or professional.
Xubuntu
Xubuntu is an elegant and easy to use operating system. Xubuntu comes with Xfce, which is a stable, light and configurable desktop environment.