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https://www.crowdAI.org is an open source alternative. Disclaimer, my research group at EPFL started the platform, because we think there should be a community-based open source version that is open to anyone. Always looking for contributors!

Edit (1): Github https://github.com/crowdAI/crowdai Edit (2): We're currently re-designing the whole site to look & feel better.

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I just looked at the site and it sounds real exciting (but way too difficult for me). Can I ask how you guys are funded? I saw that there is a ~$2000 payout for the winner of the most recent challenge.

The platform itself is funded by institutional research funding we get at EPFL. For some of the monetary prizes, these typically come from the corresponding projects.

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