There are several useful apps that you can use in Kraków during the conference. Links will direct you to Google Play or iTunes website.
The official application of the city of Kraków (Krakow.pl)
Find a bus or a tram (Jakdojade: public transport)
The official application of the city of Kraków (Kraków.pl)
Offline city map (Krakow Map and Walks)
Moreover, if you wish to stay in Kraków before the conference or after it finishes, there are plenty of cultural and sport events taking place in the city that you may find interesting.
Find the list of events such as concerts, theater plays, festivals etc. on the Karnet website.
If you are a fan of sports, you will be happy to hear that Kraków is the host of EuroVolley finale organized by the European Volleyball Confederation (CEV). The games will be held between 24th August and 3rd September. Read more here.