Naven
Answers
Is Naven open source?
The code is on GitHub. It is built and run by one person, which is worth knowing before relying on it for anything that matters.
Being able to read the code is useful for anybody evaluating what a service actually does rather than what it says. It is not the same as an audit, and nobody should treat published code as a security guarantee.
The more relevant fact for most people is the size of the operation. One person means fast changes and no redundancy.
Naven's own pages say this plainly rather than presenting the project as larger than it is.