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Lift framework is another scala web framework, which has its own actors implementation and long history. It is helpful, but I can't say it is highly maintained nowadays. Also, Lift was an opponent of Play some time ago.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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cask
Cask: a Scala HTTP micro-framework. Cask makes it easy to set up a website, backend server, or REST API using Scala (by lihaoyi)
Wonder if anyone uses: https://github.com/com-lihaoyi/cask
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.