DataDome

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.

Cloudflare Bot Management is a comprehensive solution that identifies and mitigates automated traffic to protect websites from malicious bots. It uses machine learning and behavioral analysis to differentiate between human users, good bots, and bad bots, helping to maintain site performance and security.

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.

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.

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.