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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Finagle, possibly with Finch on top.
Play, blergh for some, not blergh for others ;)
Finagle, possibly with Finch on top.
http4s
For now, Scala 3 projects can depend on the 2.13 version of Akka, but work on publishing Akka for Scala 3 seems to be progressing steadily: https://github.com/akka/akka/issues/30243
I've written sample apps in Scala 3 that all do the same thing at https://github.com/hohonuuli/msdemos using akka-http (some issues at the moment), cask, finatra (which doesn't work with Scala 3), helidon, http4s, javalin, scalatra, sparkjava, vertx, and zio-http. I wrote those as an exercise in understanding particular frameworks and benchmarking them. (I write a lot of microservices). You can peruse the code there to get a feel for what it takes to write a service in a particular framework