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

Efficient immutable updates, 2-6x faster than naive handcrafted reducer, and more than 10x faster than Immer.

Pattern Matching for Javascript

ESLint rules to disable mutation and promote fp in JavaScript and TypeScript.

A MobX powered state management solution based on data trees with first class support for Typescript, support for snapshots, patches and much more

Phel is a functional, Lisp-inspired programming language that compiles to PHP. It brings the expressive power of Clojure and the simplicity of Janet to the PHP ecosystem — enabling you to write concise, immutable, and composable code that runs anywhere PHP does.

Don't Fear the Profunctor Optics!

Docile keeps your Ruby DSLs tame and well-behaved

TSLint rules to disable mutation in TypeScript.

A very fast and lightweight Typescript library to create immutable states with a mutable syntax

GitHub Action for deploying code via rsync over ssh

State management for React

Functional programming, immutable collections and FP constructs for typescript and javascript

⚡️ λ PHP functional library focused on simplicity and performance

ABRoot is a utility that provides full immutability and atomicity to a Linux system, by transacting between two root filesystems. Updates are performed using OCI images, to ensure that the system is always in a consistent state.

Build Virtual Machine Image from Dockerfile or Docker image

Generic, Null-safe, Immutable Collections and Functional Transformations for the JVM

The Chaos Programming Language

The immutable/mutable meta-distribution (universal bootstrapper)

Immutable Package Manager