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I would say http4s and Doobie. Both are pure FP libraries in the Typelevel ecosystem. Both are exceptionally clear, extremely reliable, extremely pleasant to use… I like to point out http4s, in particular, is primarily a collection of types modeling the relevant RFCs. What behavior it has comes overwhelmingly from the underlying Cats, cats-effect, and fs2 libraries. This reflects the generality of those underlying libraries and the intense focus of the http4s team. The same applies to Rob Norris and Doobie, which tames JDBC as well as it can be tamed, IMO.
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InfluxDB
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The same creator is working on skunk, which is very exciting. Only works for Postgres though.
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Slinky for me is a perfect example of a library.
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The most popular nowadays are - I guess - akka-http and http4s. You can also use Play if you don't want to start from scratch but prefer a framework-based approach.