Top 3 Kotlin Immutability Projects

http4k

2 2,423 0.0 Kotlin

The Functional toolkit for Kotlin HTTP applications. http4k provides a simple and uniform way to serve, consume, and test HTTP services.

Project mention: What's the state of server-side frameworks with Kotlin support today for small teams? | /r/Kotlin | 2023-04-17

You named Express as an example for a good framework - I'd say both http4k and ktor come close to it. Spring Boot would really be on the other end and I met lots of JS/TS devs that didn't even want to touch it. I did have the same impression than you though: Documentation for ktor is not great at all.
NonEmptyCollections

0 50 0.0 Kotlin

A type-safe implementation for collections that cannot be empty. Life is too short for emptiness-checks!
Appwrite

appwrite.io
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Appwrite - The open-source backend cloud platform. Add Auth, Databases, Functions, and Storage to your product and build any application at any scale while using your preferred coding languages and tools.
Sprinkler

1 6 10.0 Kotlin

A non-intrusive set of extensions sprinkled over the Kotlin standard library.

Project mention: the "use" keyword for multiple resources | /r/Kotlin | 2023-03-25

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-04-17.