An implementation of Actor, Publish-Subscribe, and CSP models in one rather small C++ framework. With performance, quality, and stability proved by years in the production.

Ptolemy II is an open-source software framework supporting experimentation with actor-oriented design.

Python Actor concurrency library

YAPO e+ - Yet Another Porn Organizer (extended)

A small but fun actor framework based on loom

so5extra is a collection of various SObjectizer's extensions. so5extra is built on top of SObjectizer and intended to simplify development of SObjectizer-based applications.

Simple yet powerful actor model in golang for message passing based applications [Work in Progress]

Lightweight in-process asynchronous message based inter-components communication framework - Actor System

Lua Actor implementation for Rust (in sync/async modes)

Actor Model Library for C

Atomics, Futures, and Reactive-Streams for Swift

Phluxor Remote is a library that allows you to create remote actor systems in Phluxor.

Alkali is a small and simple actor library written in Kotlin.

A lightweight Actor Model for .NET

An asynchronous, runtime-agnostic and testable actor library.

A "slow" actor library interfacing with Actors.jl

Experimental actor library in Rust

Actor Model Library for C - Ported to CHERI

React Hook for the actor model library Tarant

Yet Another Actor Library, Concurrent Programming in Julia