[Freegis-list] Getting maps of São Paulo

[Patricia Megumi Matsumoto]

Hello

I'm a student in Brazil and I'm taking part in a project in which I have to 
implement an application for PDAs and I need to use GIS in order to do what 
I was asked to do. More specifically, I would like to implement an 
application in which I would be able to type some addresses and then, I 
would be able to see a map with some dots in the places which would 
correspond to the addresses I had typed before. (In the future, I intend to 
trace some routes in the map, in order to show to the user the best way to 
visit all the selected points). 
I've been looking for many (free) GISs and I've found many interesting 
projects. However, I couldn't find any site in which I could find maps 
(specifically of São Paulo) to use in my application. 
Would you have an idea where to find it? Would you have any suggestion 
concerning which API I should use for that?

Thank you very much =)
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