Public transport pass in Paris for tourists, called Paris Visite Pass - for bus, metro and tramway.
The pass also includes discount vouchers for a number of popular attractions, plus shopping vouchers.
Download the app named Next Stop Paris.
Just type in the address of where you are, choose a site or monument, or even another local address, then get directions on how to get there by RATP (Public Transport provider in Paris).
It also includes some everyday french phrases and sentences translated into the language of your choice.