This app was mentioned in 1 comment, with an average of 3.00 upvotes
Other than the usual like Google Maps, MTC bus timings (which is completely useless since they never follow the time table) and Zomato, Genie is a good one, basically they will do stuff / deliver things like Sathyam popcorn if you're busy (or lazy). Then you have food delivery apps like Faasos, Swiggy and Foodpanda and grocery ones like Bigbasket and Grofers.