SENSR is foremost a tool to create, share and manage a citizen science project running on mobile devices to harness the collaboration and crowdsourced power of citizen scientists. It was designed for grassroots projects where it allows people without programming skills to easily build a mobile data collection app.
It also contains a directory of grassroots citizen apps that have been created through the SENSR platform where you can search for apps via project categories, keywords or locations.
All you have to do is to download the app to your smartphone, subscribe to a project, and collect/report project data.
Available for the iPhone only.