sttp (HTTP client), http4s (HTTP client/server), quill (database access), fs2 (streaming data processing), I have some vague memory of a gRPC implementation. A

sttp (HTTP client), http4s (HTTP client/server), quill (database access), fs2 (streaming data processing), I have some vague memory of a gRPC implementation. A lot of stuff that does async in Scala tends to be written in this style because it's almost no extra cost compared to writing it in strictly async fashion.