Moblin
Moblin.org hosts the Mobile & Internet Linux Project which is an umbrella, open source project focused on the development of Linux for Intel-based devices.
Gnome Mobile
GNOME Mobile will advance the use, development and commercialization of GNOME components as a mobile and embedded user experience platform. It brings together industry leaders, expert consultants, key developers and the community and industry organizations they represent.
Maemo
Maemo provides an open source development platform for Nokia Internet Tablets and other Linux-based devices. It is build from components widely used in open desktop and mobile systems.