"The International Space Apps Challenge is an international mass collaboration focused on space exploration that takes place over 48-hours in 80 cities around the world (in 42 countries) on the weekend of April 20-21, 2013. The event embraces collaborative problem solving with a goal of producing relevant open-source solutions to address global needs applicable to both life on Earth and life in space. NASA is leading this global collaboration along with more then 150 partner organizations."
"In April, you are invited to join thousands of enthusiasts to invent and create applications to help space exploration and improve life on Earth at the International Space Apps Challenge. During this app-jam, participants are challenged to use freely available data and rework them for new purposes or present them in new ways."