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

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

A high-performance immutable mapping type for Python.

A full-stack example app built with JHipster, Spring Boot, Kotlin, Angular 4, ngrx, and Webpack

Automatically perform UITableView and UICollectionView animations between two sets of immutable data. It supports generic data types and is fully thread-safe.

A python lens library for manipulating deeply nested immutable structures

C++ as a Pure Functional Programming Language

Functional, composable, asynchronous, type-safe Python.

Immutable and persistent collections for PHP

Write small programs (eg -algorithms) in a functional way.

A typed, persistent store for values of arbitrary types

Purely functional data structures in Java

immutable datastructures in lua

Immutable/Constant Objects for JavaScript

Mutable and immutable persistent maps and sets as hash array mapped trie (HAMT) for FreePascal

Mathematical numerical named static constants useful for different disciplines

A Scala library that provides various data structures.

Reimplementing the Haskell prelude in Scala (for fun)

Scala Exercises for the Scala Optics library Monocle http://julien-truffaut.github.io/Monocle/

Persistent / Immutable array in Rust.