There are many ways you can create a crowd-sourcing platform; the following, although only one of many, allows for a significant degree of flexability and customisation for precisely zero cost. The only requirement is that your initial data be formatted as an XML.
In order to develop your crowdsourcing site, you will need accounts for the following services:
- Google: A Free E-Mailand Cloud Storage Provider
- x10host.com: A Free Hosting Service, allowing full installations of Wordpress