There are a few Dutch apps that will make life easier for you once you arrive:
9292.nl - transport app for all modes of transport including fare costs
WieBetaaltWat - app for sharing costs for example, if you go out for dinner or you have everyone over for dinner and want to split the cost with a group of people.
Datumprikker - event planning app, useful if you are on a committee and need to arrange meetings or want to find a day people are free for a day out / dinner.
Blackboard / My Uva - app for all your Uni courses and UvA’s app
VSAE - the app of our study association to stay up to date on all news and events. You can also access the exam base and photo albums through the app.