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- BotChallengePage (Ruby-on-Rails plugin, wrapping Cloudflare Turnstile)
https://bibwild.wordpress.com/2025/01/16/using-cloudflare-turnstile-to-protect-certain-pages-on-a-rails-app/ - Code4Lib Blocking Bots wiki page: https://wiki.code4lib.org/Blocking_Bots
- Anubis Proof-of-work gateway (now also at https://anubis.techaro.lol/)
Other Resources
Good description of the problem and attempts at remediation from a technical perspective: https://go-to-hellman.blogspot.com/2025/03/ai-bots-are-destroying-open-access.html
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https://shelf.io/blog/metadata-unlocks-ais-superpowers/
https://thelibre.news/foss-infrastructure-is-under-attack-by-ai-companies/
A general guide to preventing web scraping, with a good discussion of do's and don'ts: https://github.com/JonasCz/How-To-Prevent-Scraping/blob/master/README.md