bullhornContribute to Grillo’s open source earthquake early-warning system and help save lives around the globe.  Learn more

Our mission

The Call for Code Global Challenge — created by David Clark Cause and supported by Founding Partner IBM and Charitable Partner United Nations Human Rights — invites developers and problem solvers around the world to build solutions that fight back against the most pressing issues of our time. Together with The Linux Foundation, top solutions are open sourced and deployed.


Number of participants since the Challenge began

165 nations

Have contributed to create 8,000+ challenge apps

The time to build for our communities is now 

Get started with the latest open source technologies, whether that is AI, IoT or cloud. See how your code can make a real and lasting impact.

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Deployments spotlight

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Project OWL

See how this team went from winning Call for Code to deploying their mesh network technology in Puerto Rico.

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This team sought the experience of a firefighter and nurse to inform their health-monitoring system field-tested in Barcelona.

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