Open data and crowdsourcing can help improve urban planning by engaging the public. It allows citizens to describe what is in their city, highlight problems, and vote on priorities. Some examples of open data platforms for urban planning include OpenPlans for sharing city plans, Ushaidi for reporting problems, and SeeClickFix for reporting issues to local governments. When cities open their data and use crowdsourcing, it provides free hosting and backups, opportunities for international help on projects, and reusable code that is portable and adaptable to other cities.