They seem to have pivoted from protobuf tools to kafka alternatives. I don't think bufstream is OSS (yet). Or at least, they have very much de-emphasized their original offering on their site.
Nope! We're still heavily investing in scaling Protobuf. In fact, our data quality guarantees built into Bufstream are powered by Protobuf! This is simply an extension of what we do...Connect RPC, Buf CLI, etc.
I don't think bufstream itself is open source but there's https://github.com/bufbuild/bufstream-demo which may be close to what you want (but is also unlicensed, bizarrely)
That's correct. Bufstream is not open source, but we do have a demo that you can try. I've asked the team to include a proper LICENSE file as well. Thanks for catching that!