Additional functional programming idioms over and above what is available from Arrow

Open source utilities for unified software architecture

Expressive validation library for Kotlin

Toolset for creating simple parsers from raw input types, to properly validated parsed types

DSL for accessing and modifying deeply nested JSON for KotlinX Serialization with Arrow Optics

Boilerplate-free Kotlin config library for loading configuration files as data classes

Parser-combinators with Kotlin Coroutines

Better initial-style DSLs in Kotlin