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/embedded systems: the Linux kernel, Xserver, DBus, GTK+, Gstreamer, Telepathy, GnomeVFS... We develop the Hildon Application Framework in order to integrate functionality and user interface to the maemo platform. We also provide a Software Development Kit containing the tools needed to create and port applications, replicating the Internet Tablet environment in a PC.