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CrowdSec

CrowdSec · Security tools

Open-source behavior-based intrusion prevention engine whose detections feed a crowd-sourced IP reputation network, with remediation components for firewalls, proxies and CDNs

MITOpen sourceFreemiumSelf-hostedNov 2, 2026

Let's Encrypt

Internet Security Research Group (ISRG) · DNS & domains

In-depth entry

Nonprofit certificate authority that issues free, automatically renewable TLS certificates through the ACME protocol

MPL-2.0FreeNov 2, 2026

Web Authentication (WebAuthn)

W3C Web Authentication Working Group (with the FIDO Alliance) · Identity & access

W3C standard defining the browser API for creating and using public-key credentials, the basis of passkeys and FIDO2 hardware-key authentication

Open sourceFreeLocalBroken

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