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Top 23 C++ Coroutine Projects
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Project mention: How to Build a Real-Time Chat App with WebSockets (And Why It Works) | dev.to | 2026-03-19
PHP can handle WebSockets. Projects like Ratchet and Swoole exist for exactly this reason. The traditional PHP execution model — spin up a process per request, run the script, die — doesn't naturally fit persistent connections. But the ecosystem has evolved.
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Project mention: Came across the async framework userver 3.0 recently – they've moved to C++20 | news.ycombinator.com | 2026-05-28
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concurrencpp
Modern concurrency for C++. Tasks, executors, timers and C++20 coroutines to rule them all
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less_slow.cpp
Playing around "Less Slow" coding practices in C++ 20, C, CUDA, PTX, & Assembly, from numerics & SIMD to coroutines, ranges, exception handling, networking and user-space IO
Project mention: Processing Strings 109x Faster Than Nvidia on H100 | news.ycombinator.com | 2025-09-19Yes, at the scale of 128-bit registers NEON is mostly enough, except for a few categories of instructions missing in that ISA subset, like scatter/gather ops, that can yield 30% boost over serial memory accesses: https://github.com/ashvardanian/less_slow.cpp/releases/tag/v...
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libfork
A bleeding-edge, lock-free, wait-free, continuation-stealing tasking library built on C++20's coroutines
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The framework is ZealPHP — a PHP framework I've been building on top of OpenSwoole. Same PHP you already know (session_start(), $_GET(?), header(), the lot), but the runtime model is different: workers stay alive between requests, routes and shared state load once, and WebSockets share the same process as your HTTP routes. No boot-per-request, no Node sidecar for sockets, no Redis for in-memory state on small apps.
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coros
An easy-to-use and fast library for task-based parallelism, utilizing coroutines. (by mtmucha)
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UE4EnhancedCodeFlow
This code plugin for Unreal Engine provides functions that drastically improve the quality of life during the implementation of game flow in C++.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Coroutines discussion
C++ Coroutines related posts
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Came across the async framework userver 3.0 recently – they've moved to C++20
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MultiPlayer Tic-Tac-Toe with WebSocket in PHP
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Show HN: Writing a C++20M:N Scheduler from Scratch (EBR, Work-Stealing)
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Userver 2.10 Released
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Show HN: Less Slow C++
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Swoole (Coroutine-based concurrency for PHP) v6 released
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Async C++
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A note from our sponsor - SaaSHub
www.saashub.com | 19 Aug 2026
Index
What are some of the best open-source Coroutine projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Swoole | 18,906 |
| 2 | cppcoro | 3,863 |
| 3 | userver | 2,946 |
| 4 | concurrencpp | 2,757 |
| 5 | async_simple | 2,193 |
| 6 | less_slow.cpp | 1,920 |
| 7 | ue5coro | 1,100 |
| 8 | libcoro | 961 |
| 9 | libfork | 893 |
| 10 | ext-openswoole | 859 |
| 11 | restc-cpp | 650 |
| 12 | qcoro | 576 |
| 13 | coros | 333 |
| 14 | corral | 283 |
| 15 | corobase | 252 |
| 16 | Ichor | 235 |
| 17 | packio | 168 |
| 18 | UE4EnhancedCodeFlow | 144 |
| 19 | kelcoro | 143 |
| 20 | coop | 111 |
| 21 | asyncpp | 110 |
| 22 | charly-vm | 99 |
| 23 | CoFSM | 96 |
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