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OSTIF.org – Securing Open Source for the World — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Information And Network Security →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
pfsense.org ↗	73 match shared topic	pfSense® - World's Most Trusted Open Source Firewall	en	information-and-network-security	robotsllmsaihumans	emailphone	none
backbox.org ↗	73 match shared topic	BackBox.org – A Free Open Source Community Project	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
owasp.org ↗	67 match shared topic	OWASP Foundation, the Open Source Foundation for Application Security \| OWASP Foundation	en	information-and-network-security	robotsllmsaihumans	emailphone	none
bunkerweb.io ↗	67 match shared topic	BunkerWeb - The open-source Web Application Firewall (WAF)	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
insecure.org ↗	67 match shared topic	Insecure.Org - Nmap Free Security Scanner, Tools & Hacking resources	en	information-and-network-security	robotsllmsaihumans	emailphone	none
opnsense.org ↗	67 match shared topic	OPNsense® is an open source, feature rich firewall and routing platform, offering cutting-edge network protection. - OPNsense	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
openssf.org ↗	67 match shared topic	Open Source Security Foundation – Linux Foundation Projects	en	information-and-network-security WordPress	robots llmsaihumans	emailphone	none
chainguard.dev ↗	67 match shared topic	The trusted source for open source \| Chainguard	en	information-and-network-security	robotsllmsaihumans	emailphone	none
cryptomator.org ↗	67 match shared topic	Cryptomator - Free & Open-Source Cloud Storage Encryption	en	information-and-network-security	robotsllmsaihumans	emailphone	none
misp-project.org ↗	67 match shared topic	MISP Open Source Threat Intelligence Platform & Open Standards For Threat Intelligence Sharing	en	information-and-network-security	robotsllmsaihumans	emailphone	none
coreinfrastructure.org ↗	67 match shared topic	Open Source Security Foundation – Linux Foundation Projects	en	information-and-network-security WordPress	robotsllmsaihumans	emailphone	none
osv.dev ↗	67 match shared topic	OSV - Open Source Vulnerabilities	en	information-and-network-security	robotsllmsaihumans	emailphone	none
eff.org ↗	61 match shared topic	Electronic Frontier Foundation \| Defending your rights in the digital world	en	information-and-network-security Drupal	robotsllmsaihumans	emailphone	none
openpgp.org ↗	61 match shared topic	OpenPGP - OpenPGP	en	information-and-network-security	robotsllmsaihumans	emailphone	none
openid.net ↗	61 match shared topic	OpenID - OpenID Foundation	en	information-and-network-security WordPress	robots llmsaihumans	emailphone	none
seclists.org ↗	61 match shared topic	SecLists.Org Security Mailing List Archive	en	information-and-network-security	robotsllmsaihumans	emailphone	partial · 1
greenend.org.uk ↗	61 match shared topic	The Green End Organisation	United Kingdom en	information-and-network-security	robotsllmsaihumans	emailphone	none
openssl.org ↗	61 match shared topic	OpenSSL	en	information-and-network-security	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.