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Cloudflare Turnstile is a smart CAPTCHA alternative designed to provide a more user-friendly and privacy-focused approach to bot detection. It uses non-interactive challenges and machine learning to validate users without requiring them to solve puzzles or identify objects.

Friendly Captcha is an innovative proof-of-work based CAPTCHA alternative where the user's device performs computational work to prove humanity. This approach provides effective bot protection while offering a seamless, accessible user experience without traditional CAPTCHA challenges.

DataDome is an advanced cybersecurity platform specializing in bot protection and mitigation. It offers real-time solutions to safeguard websites and mobile applications against various automated threats, including malicious bot traffic, credential stuffing, and scraping, using AI and machine learning technologies.

reCAPTCHA is a free service from Google designed to protect websites from spam and abuse. It uses advanced risk analysis techniques to tell humans and bots apart, offering various types of challenges including invisible checks and interactive puzzles to ensure user authenticity.

DDoS-Guard is a Russian Internet infrastructure company that provides a range of services including DDoS protection, content delivery network (CDN) services, and web hosting. Their solutions help websites and online services maintain availability and performance in the face of distributed denial-of-service attacks.