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Cloudflare

Cloudflare, Inc. · DNS & domains

Global network offering authoritative DNS, CDN and reverse-proxy security, a domain registrar, Zero Trust access and the Workers serverless platform

ProprietaryFreemiumPaidNov 2, 2026

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

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

promptfoo

Promptfoo, Inc. · Prompting, evaluation & observability

Open-source, local-first CLI and library for evaluating prompts, models, RAG pipelines and agents, with automated red teaming and CI integration

MITOpen sourceFreeLocalSelf-hostedBroken

Semgrep

Semgrep, Inc. · Security tools

Static analysis engine that matches code patterns written in the target language's own syntax, with an LGPL community edition and a commercial AppSec platform

LGPL-2.1-onlyOpen sourceFreemiumLocalNov 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

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