https://www.historyextra.com/period/georgian/why-remember-charles-babbage-difference-engine/
Charles Babbage's Difference Engine: How The Machine Changed The World | HistoryExtra
Doron Swade considers the importance of the Difference Engine, which marked the start of automatic computing
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https://charlesbabbage.tech/
Charles Babbage 's blog
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https://hackaday.io/project/193805-3d-print-babbages-difference-engine-no2
3D Print Babbage's Difference Engine No.2 | Hackaday.io
A fully functional replica of Charles Babbage's Difference Engine No.2 with 3D printed parts
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