osint.org
Look at where the credible open source intelligence work actually gets published. Research collectives, verification outfits, transparency nonprofits, training organisations. Almost all .org, because the authority of the work depends on not resembling a vendor.
This is the discipline’s own name on that extension, and the discipline has grown from niche tradecraft to a recognised field in about five years. Journalists use it, financial investigators use it, human rights researchers built entire methodologies on it, and every defence and security organisation now has people doing it.
It would carry a training academy, a tools directory, a methodology reference, a research collective or a professional association, and each of those would gain standing from the address alone. For a commercial platform it still works as the neutral, community-facing front for a paid product.
There is one OSINT.org, the field is still expanding, and the term isn’t going to be replaced.
Serious offers considered.