Sojourner is a conference schedule viewer for the Nokia N900, the smartphone of choice for the discerning sandal-wearer. Talks can be viewed by topic, by room or by time; your favourite events can be starred for easy browsing later on.
It originally showed the schedule for FOSDEM; it has subsequently been made to show others, thanks mainly to wonderful contributors! It's written in Python and uses the Hildon widget set. Thanks to a really shonky abstraction layer—named Malvern—the application also runs with plain Gtk+, though it's not beautiful.