The team of the University of Barcelona working for the ESA Gaia mission (short: GaiaUB team) has published a first version of an app related to this mission. You can download this free app from the Apple Store at: https://itunes.apple.com/us/app/gaia-mission/id735128015.
The current version includes among other things a description of the mission, explains how the satellite will work and some aspects of the science that will be done with Gaia data.
This first version is only for iOS devices. The language of the app is English. Soon versions in Spanish and Catalan will be added. A version for Android devices is also planned. And more features are foreseen.
By the way, if you are interested to learn more about our team of scientists and engineers feel free to visit our new website: http://gaia.am.ub.es/. Thank you.