• FCC Open Internet Apps Challenge http://challenge.gov/challenges/114 5 comments 16/1/2011
• Rate our startup: Challenge.gov http://challenge.gov 54 comments 7/9/2010

• NAEP Math Automated Scoring Challenge: Use natural language processing to predict human scores on open-ended math test responses. https://www.challenge.gov/?challenge=naep-math 2 comments 8/3/2023 futurology
• NASA's Mechanical Eye Challenge https://challenge.gov/a/buzz/challenge/67/ideas/top 4 comments 26/2/2019 space
• US Government Cyber Quest is a fun and challenging online competition that tests students’ abilities to identify vulnerabilities in a virtual network and answer questions related to their findings. http://challenge.gov/dod/159-2011-cyber-quests-competition 9 comments 13/5/2011 netsec
• Contest: National Library of Medicine Show Off Your Apps: Innovative Uses of NLM Information http://challenge.gov/nih/132-nlm-show-off-your-apps-innovative-uses-of-nlm-information?utm_source=challengepost+users&utm_campaign=09e2e82cc7-challengepost_newsletter_1_a_b4_13_2011 3 comments 14/4/2011 programming
• The FCC has launched a competition to create software that can ferret out Net Neutrality violations http://challenge.gov/fcc/114-fcc-open-internet-apps-challenge 281 comments 6/1/2011 programming

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