Encourage travelling by bus

I wish to develop a mobile app to encourage commuters to travel by bus. While there are many apps already available, I wish to develop a new app that is easier to use. I need the following data and will appreciate advice on how they can be retrieved for free or at a modest cost:

• GPS location and number of all bus stops in Singapore
• Numbers of the bus services stopping at each bus stop
• Arrival time of the next bus for each service and bus stop (this need access to the servers of the bus operators)

If you have any information on the above, please write to kinlian@tankinlian.com. Thank you.