Free, practical knowledge for people who run and secure systems. Checklists you can work through today, guides from our blog grouped by topic, and a curated tools directory. Everything here is free; our paid digital products go deeper with templates and playbooks, and our services are there when you want it done for you.
Free checklists
Linux Server Hardening Checklist (2026)
Checklist · 11 sections from patching to backups, with the exact SSH, sysctl and firewall settings. Mapped to CIS.
ISO 27001:2022 Readiness Checklist
Checklist · Self-assess against clauses 4–10 and all 93 Annex A controls, with a scoring guide and the mandatory documents list.
Coming next: OSINT investigation quick-reference card and a WordPress security checklist. Follow us on LinkedIn to hear when they are out.
Tools directory
Our OSINT & Security Tools Directory lists 180+ tools across 20 categories — username, email and phone lookups, image and geolocation analysis, dark-web and threat intelligence, infrastructure recon, compliance and pentest. Each has a one-line explanation, pricing badge and a heart to save your favourites.
- Blockchain & Crypto Tracing 15
- Breach & Leak Data 7
- Compliance & Server Hardening 12
- Dark Web & Threat Intelligence 11
- Email OSINT 6
- General Search 16
- Geolocation & Maps 11
- Google Dorks & Advanced Search 7
- Image & Video Analysis 12
- IP, Domain & Infrastructure 20
- Metadata & File Analysis 6
- OSINT Frameworks & Collections 7
- People & Company Research 10
- Phone Number OSINT 5
- Social Media OSINT 7
- Transport & Vehicle Tracking 6
- Username OSINT 6
- Vulnerability & Pentest 10
- Web Archives & Caches 4
- Web Scraping & Automation 8
Guides by topic
ISO 27001 & compliance
DevOps & automation
Go deeper
- Digital products: the OSINT Investigator’s Toolkit and the ISO 27001:2022 Starter Kit — templates, playbooks and the hidden tool lists we use ourselves
- Services: ISO 27001 readiness, Linux hardening audits, VAPT and OSINT investigations, delivered personally
- Suggest a resource: tell us what checklist or guide would help you most