I came across cryptpad as cryptpad.cz but couldn't figure out who was behind it at the time. At least with this link you can get to at least one seemingly legit dev, which makes me take it more seriously. Is cryptpad.cz a fork of this or vice versa?
CryptPad.org is the official website of the project (and cryptpad.fr an instance maintained by the original devs).
There is our white paper on the security features of CryptPad: https://blog.cryptpad.org/2023/02/02/Whitepaper/
In terms of audits, we don't have the funding for formal audits but a couple years ago the European Community paid a bug bounty https://commission.europa.eu/news/european-commissions-open-...
We received some interesting reports but not as much on the cryptography than on web related issues
Ludovic
Ludovic, from the CryptPad team.
(I work for XWiki, on XWiki though)