That's right, but I know several project maintainers who are looking moving to it because BoringSSL's scope is smaller and is sufficient for their projects' needs. That's why I think the BoringSSL's API status will evolve with time. And Ring is based on it, so...

Then there's ocaml-tls which aims to provide a drop-in implementation of the OpenSSL API too.

We're finally seeing much activibity, and in that sense, I'm glad that Heartbleed happened, but it should have been earlier :).