Open-source concurrency software
1020 open-source libraries, tools and applications tagged concurrency, ranked by how closely concurrency is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.
1020 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| Ergo Framework Ergo Framework is a Go framework implementing the actor model with network transparency, inspired by Erlang/OTP design patterns. It provide… | 85 | 4676 | active |
| cameron314/readerwriterqueue A fast, wait-free single-producer single-consumer (SPSC) lock-free queue for C++11, implemented as a header-only library. It supports move … | 65 | 4631 | stable |
| petkaantonov/bluebird Bluebird is a full-featured Promises/A+ compliant promise library for JavaScript with a focus on performance and rich utility methods like … | 23 | 20486 | maintenance |
| FreeRTOS The classic FreeRTOS distribution, a real-time operating system for microcontrollers and small microprocessors that submodules the FreeRTOS… | 82 | 4559 | stable |
| orcaman/concurrent-map A thread-safe concurrent map implementation for Go that shards the map to minimize lock contention. It predates and complements the stdlib … | 23 | 4527 | stable |
| ReactiveX/RxAndroid RxAndroid provides Android-specific bindings for RxJava 3, adding the minimal classes needed to write reactive components in Android apps. … | 64 | 19919 | maintenance |
| DPDK/dpdk DPDK is a set of C libraries and NIC drivers for fast userspace packet processing, bypassing the kernel network stack. It supports multiple… | 77 | 4452 | stable |
| amphp/amp amphp/amp is the core library of the AMPHP ecosystem, providing futures, coroutines, and cancellation primitives for non-blocking, event-dr… | 81 | 4434 | stable |
| zio/zio ZIO is a zero-dependency Scala library for type-safe, composable asynchronous and concurrent programming, built on lightweight fibers. It p… | 95 | 4428 | stable |
| joblib/joblib Joblib is a Python library for lightweight pipelining: running Python functions in parallel with multiprocessing/threading backends and mem… | 89 | 4408 | stable |
| PaperMC/Folia Folia is a fork of the Paper Minecraft server that adds regionised multithreading, splitting the world into independent regions each with i… | 74 | 4370 | active |
| facebook/Haxl Haxl is a Haskell library that simplifies access to remote data sources such as databases and web services. It automatically batches reques… | 52 | 4369 | stable |
| failsafe-lib/failsafe Failsafe is a lightweight, zero-dependency Java library for fault tolerance, wrapping executable logic with composable resilience policies … | 55 | 4313 | active |
| eventmachine/eventmachine EventMachine is an event-driven I/O and lightweight concurrency library for Ruby based on the Reactor pattern. It enables building highly s… | 62 | 4280 | stable |
| grosser/parallel A Ruby gem that makes parallel processing simple, supporting parallel map/each/flat_map over processes, threads, or Ractors. It is best sui… | 76 | 4270 | stable |
| F-Stack/f-stack F-Stack is an open-source high-performance user-space network framework based on DPDK, featuring a ported FreeBSD 11 TCP/IP stack, a Posix-… | 81 | 4267 | stable |
| lukas-krecan/ShedLock ShedLock is a Java library that ensures scheduled tasks are executed at most once at the same time across multiple nodes by acquiring time-… | 77 | 4231 | stable |
| baidu/braft braft is an industrial-grade C++ implementation of the RAFT consensus algorithm and replicated state machine, built on top of brpc. It is d… | 23 | 4230 | stable |
| typhoeus/typhoeus Typhoeus is a Ruby library that wraps libcurl to make fast, reliable HTTP requests, including running many requests in parallel via its Hyd… | 61 | 4134 | stable |
| xacrimon/dashmap DashMap is a blazingly fast concurrent HashMap implementation for Rust with an API similar to std::collections::HashMap. It serves as a dir… | 69 | 4119 | stable |
| hashicorp/memberlist A Go library implementing gossip-based cluster membership and node failure detection, based on the SWIM protocol with Lifeguard extensions.… | 89 | 4117 | stable |
| cenkalti/backoff A Go library implementing the exponential backoff algorithm with a Retry helper for retrying operations. It supports configurable retry lim… | 76 | 4085 | stable |
| apache/nuttx Apache NuttX is a mature, open-source real-time operating system (RTOS) for embedded systems with an emphasis on POSIX/ANSI standards compl… | 77 | 4071 | stable |
| go-redsync/redsync Redsync is a Go library implementing the Redlock algorithm for distributed mutual exclusion locks backed by Redis. It supports multiple Red… | 77 | 4050 | stable |
| bee-queue/bee-queue Bee-Queue is a simple, fast, robust job/task queue library for Node.js backed by Redis. It is designed for distributed worker pools handlin… | 72 | 4038 | active |
| awaitility/awaitility Awaitility is a small Java DSL for synchronizing and testing asynchronous operations with readable, concise expectations. It handles pollin… | 63 | 4028 | stable |
| Cysharp/R3 R3 is a modern reimplementation of Reactive Extensions (Rx) for .NET, succeeding dotnet/reactive and UniRx with a redesigned core focused o… | 75 | 4018 | active |
| jruby/jruby JRuby is an implementation of the Ruby programming language that runs on the Java Virtual Machine. It offers true parallelism without a glo… | 99 | 3923 | active |
| JCTools/JCTools JCTools is a Java library providing high-performance concurrent data structures missing from the JDK, notably lock-free and wait-free queue… | 88 | 3877 | stable |
| google/promises Google's Promises is a framework providing a synchronization construct for Swift and Objective-C to simplify writing asynchronous code. It … | 83 | 3827 | stable |
| sofastack/sofa-jraft SOFAJRaft is a production-grade, high-performance Java implementation of the RAFT consensus algorithm, ported from Baidu's braft. It suppor… | 73 | 3823 | stable |
| vlcn-io/cr-sqlite cr-sqlite is a run-time loadable extension for SQLite and libSQL, written in Rust, that adds multi-master replication and CRDT-based confli… | 62 | 3804 | active |
| Muduo Muduo is a multithreaded C++11 network library based on the reactor pattern, providing event-driven TCP networking for Linux servers. It us… | 45 | 16258 | maintenance |
| axboe/liburing A C library providing helpers to set up and tear down Linux io_uring instances, plus a simplified convenience API for applications that don… | 83 | 3787 | active |
| apple/swift-async-algorithms An open-source Swift package providing asynchronous sequence algorithms built on async/await and AsyncSequence. It includes time-based oper… | 94 | 3713 | stable |
| littlekernel/lk LK (Little Kernel) is a small SMP-aware embedded kernel written in C, portable to many 32- and 64-bit CPU architectures including ARM, RISC… | 77 | 3705 | active |
| sony/gobreaker gobreaker is a Go library implementing the Circuit Breaker pattern as a generic, configurable state machine. It prevents sending requests l… | 58 | 3700 | stable |
| reactor/reactor The Reactor Bill of Materials (BOM) is a curated set of compatible versions for Project Reactor modules such as reactor-core, reactor-netty… | 95 | 3692 | stable |
| spdk/spdk SPDK is a set of C libraries, drivers, and tools for building high-performance, scalable user-mode storage applications. It moves storage d… | 89 | 3683 | stable |
| DataDog/glommio Glommio is a Rust async runtime crate implementing a cooperative thread-per-core architecture built on Linux io_uring. It lets developers w… | 64 | 3663 | active |
| TimelyDataflow/timely-dataflow A modular Rust implementation of the timely dataflow computational model from the Naiad paper, providing a low-latency cyclic data-parallel… | 89 | 3649 | active |
| Netflix/concurrency-limits A Java library that applies TCP congestion control concepts to automatically detect and enforce concurrency limits for services. It uses la… | 52 | 3615 | active |
| mitchellh/libxev libxev is a cross-platform, high-performance event loop library written in Zig that provides a unified proactor-style API for non-blocking … | 70 | 3580 | stable |
| nutsdb/nutsdb NutsDB is a simple, fast, embeddable and persistent key/value store written in pure Go. It supports fully serializable transactions and dat… | 70 | 3579 | active |
| chrislusf/gleam Gleam is a fast, efficient distributed map/reduce execution system written in pure Go, defining computations as DAG flows that can run stan… | 75 | 3567 | active |
| NoFlo NoFlo is a JavaScript implementation of Flow-Based Programming (FBP), where applications are defined as graphs of independent components co… | 68 | 3557 | active |
| kriskowal/q Q is a JavaScript promise library implementing the Promises/A+ specification for asynchronous flow control in Node.js and browsers. It pred… | 10 | 14995 | maintenance |
| Eclipse ThreadX Eclipse ThreadX is an advanced real-time operating system (RTOS) for deeply embedded applications, featuring a picokernel architecture, pre… | 90 | 3538 | active |
| andywer/threads.js threads.js is a TypeScript library that provides a uniform API for spawning and communicating with workers, using web workers in browsers a… | 23 | 3527 | stable |
| grosser/parallel_tests A Ruby gem that speeds up test suites by splitting Minitest, RSpec, Cucumber, Spinach, and Turnip tests into balanced groups and running th… | 75 | 3524 | active |
| thomasdondorf/puppeteer-cluster A Node.js library that manages a pool of Puppeteer-controlled Chromium instances for running browser tasks in parallel. It handles job queu… | 53 | 3515 | stable |
| Suor/funcy Funcy is a Python library providing a practical collection of functional programming tools inspired by Clojure and Underscore. It offers ut… | 75 | 3511 | stable |
| hashicorp/go-memdb A Go library implementing an in-memory database built on immutable radix trees, with schema-defined tables and indexes. It provides MVCC, A… | 59 | 3476 | stable |
| actor-framework/actor-framework CAF (C++ Actor Framework) is an open-source implementation of the Actor Model in C++, providing lightweight actors, network-transparent mes… | 86 | 3442 | stable |
| ReactiveX/rxdart RxDart is the ReactiveX implementation for Dart, providing observable streams and composable operators on top of native Dart Streams. It in… | 58 | 3432 | active |
| Amanieu/parking_lot A Rust library providing compact, faster implementations of Mutex, RwLock, Condvar, Once, and ReentrantMutex compared to the standard libra… | 79 | 3424 | stable |
| malcommac/SwiftLocation SwiftLocation is a lightweight Swift wrapper around Apple's CoreLocation framework built on the async/await concurrency model. It replaces … | 23 | 3423 | active |
| samber/mo samber/mo is a Go library providing monads and functional programming abstractions such as Option, Result, Either, Future, IO, Task, and St… | 87 | 3421 | stable |
| mxcl/PromiseKit PromiseKit is a Swift and Objective-C library implementing promises to simplify asynchronous programming. It supports iOS, macOS, tvOS, wat… | 57 | 14220 | maintenance |
| scopsy/await-to-js await-to-js is a tiny TypeScript utility library that wraps promises in an async/await-friendly helper, returning [error, data] tuples inst… | 32 | 3357 | stable |
| Minestom/Minestom Minestom is an open-source, lightweight Minecraft server implementation written from scratch in modern Java, with no legacy NMS code. It pr… | 99 | 3309 | active |
| ikawrakow/ik_llama.cpp A fork of llama.cpp offering state-of-the-art quantization types and improved CPU/CUDA inference performance for large language models. It … | 60 | 3304 | active |
| Bree Bree is a job/task scheduler library for Node.js and JavaScript supporting cron, Date, ms, and human-readable interval syntax. It runs jobs… | 69 | 3293 | active |
| lsalzman/enet ENet is a C library providing reliable UDP networking with features like channels, reliability, and congestion control. It is designed for … | 68 | 3291 | stable |
| Tinche/aiofiles aiofiles is an Apache-2.0 licensed Python library providing asynchronous file I/O for asyncio applications by delegating blocking file oper… | 68 | 3264 | stable |
| ampproject/worker-dom WorkerDOM is a TypeScript implementation of the DOM API designed to run inside a Web Worker, syncing only necessary DOM mutations to the ma… | 67 | 3263 | active |
| aeron-io/agrona Agrona is a Java library of high-performance data structures and utility methods, including primitive-specialized collections, lock-free qu… | 93 | 3255 | active |
| truffleruby/truffleruby TruffleRuby is a high-performance implementation of the Ruby programming language built on GraalVM's Truffle framework. It aims for full MR… | 92 | 3227 | active |
| cloudflare/tableflip A Go library for gracefully restarting network services without dropping existing connections, by spawning a new process and transferring l… | 54 | 3213 | stable |
| yitter/IdGenerator A high-performance unique numeric ID generator library implementing an optimized Snowflake ('drift') algorithm, natively available in C#, J… | 26 | 3213 | active |
| golang/groupcache groupcache is a Go distributed caching and cache-filling library intended as a replacement for a pool of memcached nodes. It embeds both cl… | 32 | 13333 | maintenance |
| apache/curator Apache Curator is a high-level Java/JVM client library for Apache ZooKeeper, a distributed coordination service. It provides a simplified A… | 64 | 3171 | stable |
| ETLCPP/etl The Embedded Template Library (ETL) is a C++ library providing STL-like containers, algorithms, and utilities designed for embedded systems… | 97 | 3139 | active |
| lammps/lammps LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator) is an open-source classical molecular dynamics simulation code focused o… | 95 | 3104 | stable |
| jobrunr/jobrunr JobRunr is a Java library for performing distributed background processing on the JVM using Java 8 lambdas, with jobs persisted in an exist… | 99 | 3099 | active |
| nix-rust/nix A Rust crate providing safe, friendly bindings to Unix-like platform APIs (Linux, macOS, BSD, etc.), wrapping unsafe libc calls in typed, R… | 77 | 3081 | active |
| bshoshany/thread-pool BS::thread_pool is a fast, lightweight, header-only C++17/C++20/C++23 thread pool library for submitting tasks to a pool of worker threads … | 52 | 3064 | stable |
| socketry/falcon Falcon is a high-performance, multi-process, multi-fiber rack-compatible HTTP web server for Ruby, built on the async ecosystem. It nativel… | 91 | 3041 | active |
| apache/commons-lang Apache Commons Lang is a Java utility library providing helper methods that supplement the java.lang API, including string manipulation, re… | 77 | 3015 | stable |
| salsa-rs/salsa Salsa is a Rust framework for on-demand, incrementalized computation, where programs are defined as memoized queries over inputs. It intell… | 94 | 2998 | active |
| kubernetes-sigs/controller-runtime A set of Go libraries for building Kubernetes controllers and operators, providing a manager, controller, builder, and client abstractions … | 99 | 2979 | active |
| madler/pigz pigz is a parallel implementation of gzip that fully exploits multiple processors and cores when compressing data. It is a drop-in replacem… | 45 | 2979 | stable |
| avast/retry-go A simple Go library providing a retry mechanism for retrying failing operations with configurable attempts, delays, and backoff strategies.… | 70 | 2965 | stable |
| peterq/pan-light pan-light is an unofficial Baidu Netdisk (Baidu Yun) desktop client built with Go and Qt5/QML that achieves high-speed segmented downloads … | 23 | 12117 | maintenance |
| EventEmitter2/EventEmitter2 EventEmitter2 is a drop-in replacement for Node.js's EventEmitter with extended features like namespaces, wildcards, TTL listeners, and asy… | 23 | 2939 | stable |
| TheHPXProject/hpx HPX is a C++ Standard Library for parallelism and concurrency that implements C++ standard parallel facilities and extends them to distribu… | 67 | 2936 | stable |
| sindresorhus/p-limit A tiny JavaScript library that limits the concurrency of promise-returning and async functions, so only a fixed number run at once. It work… | 92 | 2928 | stable |
| deeplethe/forkd forkd is a microVM sandbox runtime for AI agent fan-out, built on Firecracker, that forks up to 100 isolated child VMs in ~100ms from a war… | 75 | 2924 | active |
| tj/co co is a JavaScript library for Node.js and the browser that provides generator-based async control flow, letting you write non-blocking cod… | 32 | 11830 | maintenance |
| cashapp/turbine Turbine is a small Kotlin testing library for kotlinx.coroutines Flow. It wraps flows in a Turbine channel-based API with awaitItem/awaitCo… | 67 | 2864 | active |
| aicareles/Android-BLE An Android Bluetooth Low Energy (BLE) framework in Java that wraps all BLE operations—scanning, connecting, notifications, read/write, RSSI… | 23 | 2851 | active |
| benmanns/goworker goworker is a Go library for running Resque-compatible background job workers, consuming jobs from Redis queues pushed by Ruby/Rails Resque… | 75 | 2849 | active |
| tokio-rs/loom Loom is a testing tool for concurrent Rust code that exhaustively explores possible interleavings of concurrent executions under the C11 me… | 50 | 2834 | active |
| spatie/crawler A PHP library by Spatie for crawling links on websites, built on Guzzle promises for concurrent requests. It can execute JavaScript via Chr… | 91 | 2831 | active |
| spatie/async A PHP library providing a small, easy-to-use wrapper around PHP's PCNTL extension for running code in parallel processes. It offers a pool-… | 68 | 2813 | active |
| IoLanguage/io Io is a small, dynamic prototype-based programming language implemented in C, inspired by Self, Smalltalk, Lisp, and Lua, where everything … | 67 | 2803 | active |
| OpenCombine/OpenCombine An open-source Swift implementation of Apple's Combine framework for reactive, value-over-time processing. It enables Combine-compatible co… | 23 | 2794 | active |
| David-Haim/concurrencpp A modern C++ concurrency library built on C++20 coroutines, providing tasks, executors, timers, and result objects for writing asynchronous… | 28 | 2774 | stable |
| lingochamp/FileDownloader FileDownloader is an Android multi-task file download engine written in Java, supporting multi-threaded connections, breakpoint-resume, and… | 23 | 11128 | maintenance |
| xiaonanln/goworld GoWorld is a scalable distributed game server engine written in Go, featuring spaces and entities with AOI support, hot-swappable game logi… | 42 | 2720 | active |