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Yahoo released their geographic data catalogue under open license and it still lives on as https://whosonfirst.org/

Afaik https://en.wikipedia.org/wiki/Apache_ZooKeeper started at Yahoo

https://vespa.ai/ was Yahoo's search engine for news and other content product, now spinned off (https://techcrunch.com/2023/10/04/yahoo-spins-out-vespa-its-...)