CrowdAI is an open data challenge platform. It has a scientific and an educational purpose: invite anyone to solve interesting data science challenges, and teach others how to do it at the same time.
Food Repo is an open access database on information about barcoded food products sold in Switzerland. Accessible through an open API, it is the largest open data source on Swiss products.
Crowdbreaks is a crowdsourced disease surveillance system, which is designed to track trends about major health and disease-related issues in real-time across different countries. The project will soon be launched.