Fail2Ban
Fail2Ban project · Security tools
Log-scanning intrusion-prevention daemon that temporarily bans IP addresses showing repeated authentication failures by updating firewall rules
GPL-2.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026
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Let's Encrypt
Internet Security Research Group (ISRG) · DNS & domains
Nonprofit certificate authority that issues free, automatically renewable TLS certificates through the ACME protocol
MPL-2.0FreeNov 2, 2026
OpenSSH
OpenBSD Project · Tunneling & remote access
Reference implementation of the SSH protocol from the OpenBSD project: remote shell, file transfer, port forwarding, key agent and certificate authority tooling
SSH-OpenSSHOpen sourceFreeLocalSelf-hostedNov 2, 2026
Trivy
Aqua Security · Security tools
Open-source scanner that finds known vulnerabilities, misconfigurations, exposed secrets and license issues in container images, file systems, git repositories, IaC and Kubernetes clusters
Apache-2.0Open sourceFreeLocalSelf-hostedNov 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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