Open-Source Security Tools
Practical security tools you can run yourself
Free, open-source tools and calculators for DNS backup, GitHub backup, AI-prompt security, post-quantum TLS testing, and cloud cost estimation. Built to make useful security work repeatable, recoverable, and easy to operate.
Built by Myles Agnew · Cloudflare, AWS, Azure, GCP, WordPress · Sydney, AU
Tools you can run in the browser
No install required — open, enter your details, and run.
Post-Quantum Tester →Run a real post-quantum TLS handshake against any site to check for quantum-safe key exchange (X25519MLKEM768 / ML-KEM).
Redirect Tracer →Trace every hop a link takes — 301/302/307/308, meta refresh and JavaScript redirects — with status codes, headers, timings and TLS details.
Phishing Email Analyser →Paste a suspicious email and see every warning sign — urgency, credential and MFA-code requests, lookalike links, risky attachments, SPF/DKIM/DMARC failures — with an explainable 0–100 risk score. Runs 100% in your browser; nothing is uploaded.
Network Traffic Triage Tool →Upload a Wireshark CSV export and learn to triage it like a SOC analyst — busy hosts, possible scanning, ICMP, DNS and SYN activity, each alert explained with benign alternatives. Runs 100% in your browser; nothing is uploaded.
Windows Event Log Triage Tool →Upload a Windows Security log CSV and learn to triage it like a SOC analyst — failed logons, password guessing, new accounts, privilege changes and cleared logs, each finding explained with benign alternatives. Runs 100% in your browser; nothing is uploaded.
S3 + CloudFront Cost Calculator →Estimate monthly cost for static hosting, download assets, CDN traffic, cache misses, and invalidations before you quote.
Cloudflare DNS Backup →How to keep every Cloudflare zone versioned, exportable to BIND, and recoverable before a bad change causes downtime.
Automation scripts & deployments
Open-source scripts and workflows to automate the security work you'd otherwise do by hand.
github-backup →Bash scripts that snapshot every GitHub repository an account owns — off-platform backup for your whole GitHub presence.
AI Agent System Prompts →Ten copy-ready system prompts for AI business agents — receptionist, sales, customer success, CRM, bookkeeping and more — each with guardrails and human sign-off rules.
promptgenie →Prompt linting, static risk scanning, testing, and CI workflows for safer AI-agent prompt pipelines.
cloudflare-backup ↗Automated Cloudflare DNS record backup script. Version and recover DNS configs before migrations or account changes.
n8n-json ↗Ready-to-import n8n automation workflows for security alerts, notifications, and operational pipelines.
dns-blocklists ↗Curated DNS blocklists for Pi-hole and similar resolvers — block ads, trackers, and malicious domains at the network level.
poc_opencti ↗Complete Docker deployment for OpenCTI — spin up a full threat-intelligence platform for a home lab or evaluation.
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Practical security tools, checklists, and workflows for website, DNS, cloud, and automation hardening. No enterprise theatre, no fluff.