I recently discovered that https://docs.docker.com/ uses Hugo. They have migrated to Hugo around 2 weeks ago.
Additional info
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Relevant commit on GitHub: https://github.com/docker/docs/commit/a0d21ade2f3344c61c32a4c42e43d9fd59e4a37c
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You can view source of any page and locate this in the
<head>section:<meta name=generator content="Hugo 0.116.1">