If you want to learn about the concept and armsrace, here is a paper with plenty of resources (this is in a game context, though not website, although there is the most advanced detection here): http://iseclab.org/papers/botdetection-article.pdf
Here is an open source system demo'd at BlackHat Europe 2011 (that checks it is a proper browser (with DOM/Javascript/etc), also good against DDoS.
https://github.com/yuri-gushin/Roboo
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Do you know the names of any such services off the top of your head? Thanks
If you want to learn about the concept and armsrace, here is a paper with plenty of resources (this is in a game context, though not website, although there is the most advanced detection here): http://iseclab.org/papers/botdetection-article.pdf
Here is an open source system demo'd at BlackHat Europe 2011 (that checks it is a proper browser (with DOM/Javascript/etc), also good against DDoS. https://github.com/yuri-gushin/Roboo
Project Honeypot (scans inbound ips) good against spambots: https://www.projecthoneypot.org/
Here are some commercial solutions: CloudFlare's ScrapeShield -https://www.cloudflare.com/apps/scrapeshield
Distil Networks - http://www.distilnetworks.com/
Scrape Sentry - http://www.scrapesentry.com/
Fireblade - http://www.fireblade.com/
Great. Thank you.