vavr-io / vavr

vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.

immutables / immutables

Java annotation processor to create immutable objects and builders, for records too. Sweep boilerplate code under the rug!

eclipse-collections / eclipse-collections

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.

louthy / language-ext

C# pure functional programming framework - come and get declarative!

babyfish-ct / jimmer

The most advanced ORM of JVM, for both java & kotlin

Kotlin / kotlinx.collections.immutable

Immutable persistent collections for Kotlin