Toolz is a creative and interactive studio. We develop topnotch apps for the web, tablets, mobiles and desktop. We worked a prototype of collaborative urbanism based on a highly interactive 3D Geographic Information System. Our first case is a favela in Rio de Janeiro : the favela has been modeled in 3D with a list of urban and sustainable projects, each of them being presented in details and in interactive 3D. Our solution aims to become a platform for citizen to discover, comment and vote for projects and take part to the decision making process.