Mark-a-Spot is a web-based platform to display, categorize, comment and rate places in urban environments. It can be used as a participation platform or it can be used to let local citizens report issues, like pot-holes, broken street lighting or lack of accessibility.
The system uses Google Maps to show the location of reported problems. You can see a demo of the system in action at MaS-City. Mark-a-Spot is free for local authorities to implement and licensed under the GNU Affero General Public License.