CartoDB has been launched as an open tool after being used internally by Vizzuality to create successful data-driven applications, and is now inviting developers and designers to join a one-day event called CartoDay, where attendees will work together on mapping applications using the platform. The event promises to be a fun and collaborative experience with plenty of opportunities for innovation and learning. Attendees can sign up through the website days.cartodb.com, which also highlights the diversity of the community attending the event.