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AltData Atlas — The open directory of alternative data — 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

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
zimbra.com ↗	15 match shared topic	Open Standards \| Low-Risk Alternative \| Data Sovereignty \| Zimbra	en	email WordPress	robotsllmsaihumans	emailphone	none
postgresql.org ↗	10 match shared topic	PostgreSQL: The world's most advanced open source database	en	databases	robotsllmsaihumans	emailphone	none
doaj.org ↗	10 match shared topic	Directory of Open Access Journals – DOAJ	en	publishing-industry	robotsllmsaihumans	emailphone	partial · 8
opendatacommons.org ↗	10 match shared topic	Home — Open Data Commons: legal tools for open data	en	law	robotsllmsaihumans	emailphone	none
cmsimple-xh.org ↗	10 match shared topic	CMSimple_XH \| flat file \| CMS \| without database \| open source	en	web-development	robotsllmsaihumans	emailphone	partial · 1
mariadb.com ↗	10 match shared topic	MariaDB Enterprise Open Source Database \| MariaDB	en	databases WordPress WooCommerce	robots llmsaihumans	emailphone	none
carbonite.com ↗	10 match shared topic	Carbonite by OpenText - Backup & data protection for home & business	en	data-storage-and-warehousing	robotsllmsaihumans	emailphone	none
chatwoot.com ↗	10 match shared topic	Chatwoot: AI-powered, open-source customer support platform. Self-host or cloud. Alternative to Intercom & Zendesk.	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
freescout.net ↗	10 match shared topic	Best open source help desk: Zendesk & Help Scout alternative	en	technology-and-computing WordPress WooCommerce	robotsllmsaihumans	emailphone	none
finnhub.io ↗	10 match shared topic	Finnhub Stock APIs - Real-time stock prices, Company fundamentals, Estimates, and Alternative data.	en	stocks-and-bonds	robotsllmsaihumans	emailphone	none
percona.com ↗	10 match shared topic	Open Source Database Software, Support and Services - Percona	en	databases WordPress	robotsllmsaihumans	emailphone	none
openapis.org ↗	10 match shared topic	OpenAPI Initiative – The OpenAPI Initiative provides an open source, technical community, within which industry participants may easily contribute to building a vendor-neutral, portable and an open specification for providing technical metadata for REST APIs – the “OpenAPI Specification”	en	technology-and-computing WordPress	robotsllmsaihumans	emailphone	none
opendefinition.org ↗	10 match shared topic	The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge	en		robotsllmsaihumans	emailphone	none
formbricks.com ↗	10 match shared topic	The Open Source Experience Data Hub	en	technology-and-computing	robots llmsaihumans	emailphone	none
metabase.com ↗	10 match shared topic	Open source AI analytics for data teams \| Metabase	en	databases	robotsllmsaihumans	emailphone	none
ckan.org ↗	10 match shared topic	CKAN - The open source data management system	en	databases	robotsllmsaihumans	emailphone	none
ogc.org ↗	10 match shared topic	OGC \| Open Geospatial Standards for Location Data & GIS	en	maps-and-navigation WordPress	robots llmsaihumans	emailphone	none
opengeospatial.org ↗	10 match shared topic	OGC \| Open Geospatial Standards for Location Data & GIS	en	maps-and-navigation WordPress	robots llmsaihumans	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.