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Project Gutenberg partnered with Microsoft to make over 5000 new audiobooks.
They are freely available at
https://marhamilresearch4.blob.core.windows.net/gutenberg-public/Website/index.html
as well as popular podcast download sites. Read more about this effort, and see a video of Project Gutenberg CEO Greg Newby talking about it:
https://customers.microsoft.com/en-us/story/1646266241611394912-project-gutenberg-nonprofit-azure-synapse-analytics-azure-ai-services