A whole different tamale, but Apache Iggy feels similar-ish, as a persistent message streaming system. Also using UDP, this time with QUIC, which is a pretty future-forward protocol that I love to see targetted (also has a rest API and its own binary protocol). https://iggy.apache.org/
I had not heard of Iggy, love the mascot! Looks to be pretty comprehensive messaging system focusing on persistent streams; lots of batteries included like auth and monitoring.
While that has some sick throughput benchmarks, it is a pretty different architecture and Aeron will have way (orders) lower and more stable latencies. But it won’t work on as many networks as Iggy.
Iggy client SDKs are easy to make because they just need to speak socket. Aeron client SDKs are “easy” to make because they just need to figure out framing shared memory. (And the orchestrator handles the network getting it there).