The power of the local community can solve great problems.
This application would connect a neighborhood in order to finance public works projects. Someone would propose a project, such as adding four sidewalk ramps on a set of corners. People in the neighborhood could then commit a certain amount of money until the goal was met.
There should be some generic projects people can propose to encourage participation. Some things that come to mind: Adding sidewalk ramps to four corners, bike parking, road repaving, Adding bioswales.
The costs would obviously be higher for individual projects than if it was done for a whole area. So, larger-scale participation would be helpful for the apps success.
Outside of financing projects, this could also be used as a planning tool. Although not everyone is a city planner, people certainly are aware of the area they live in. This could encourage unique traffic solutions.
This is just an initial idea. Any ideas that would help are welcome.