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Top 18 C++ RPC Projects
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Project mention: I wasted weeks hand optimizing assembly because I benchmarked on random data | news.ycombinator.com | 2025-07-24
(((uint32_t)clz + 7) * 9) >> 6
3. Hand roll a jump table taking advantage of arm's fixed instruction width to calculate the jump target with a shift.
https://github.com/protocolbuffers/protobuf/commit/b039dfe26...
This results in one branch for 1 byte varints, plus one additional branch for any larger size, and the branch predictor does not have to track a varying trip count through a loop. This approach resulted in a 2.64% speedup for overall encoding (which includes a lot more than just varints) on mid sized arm cores.
I think it's very difficult to beat a single comparison and branch for the 1 byte case for actual encoding forwards or backwards, unless you know there's going to be long runs of one-byte values.
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aria2
aria2 is a lightweight multi-protocol & multi-source, cross platform download utility operated in command-line. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.
Project mention: Faster and More Reliable Hugging Face Downloads Using aria2 and GNU Parallel | dev.to | 2025-03-22aria2: A lightweight multi-protocol & multi-source command-line download utility.
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FlatBuffers, also developed by Google, is a highly optimized serialization library designed for scenarios where zero-copy deserialization is required.
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brpc
brpc is an Industrial-grade RPC framework using C++ Language, which is often used in high performance system such as Search, Storage, Machine learning, Advertisement, Recommendation etc. "brpc" means "better RPC".
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ice
All-in-one solution for creating networked applications with RPC, pub/sub, server deployment, and more. (by zeroc-ice)
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Project mention: Show HN: CXXStateTree – A modern C++ library for hierarchical state machines | news.ycombinator.com | 2025-07-06
You'll see a fairly even split amongst S-tier, "possibly headed for standardization" level libraries. I'd say there's a skew for `#ifndef` in projects that are more "aspires to the standard library" and for `#pragma once` in projects that are more focused on like a very specific vertical.
`#pragma once` seems to be far preferred for internal code, there's an argument for being strictly conforming if you're putting out a library. I've converted stuff to `#ifndef` before sharing it, but I think heavy C++ people usually type `#pragma once` in the privacy of their own little repository.
- `spdlog`: `#pragma once` https://github.com/gabime/spdlog/blob/v1.x/include/spdlog/as...
- `absl`: `#ifndef` https://github.com/abseil/abseil-cpp/blob/master/absl/base/a...
- `zpp_bits`: `#ifndef` https://github.com/eyalz800/zpp_bits/blob/main/zpp_bits.h
- `stringzilla` `#ifndef` https://github.com/ashvardanian/StringZilla/blob/main/includ...
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areg-sdk
Remote objects act local. C++ Async RPC for threads and processes with auto-discovery and zero-boilerplate messaging.
Long time I was not here and I am very sure that none missed me :) I was busy developing new features of areg skd and creating user interface tool for areg sdk. And I must say, that working almost alone for more these 2 project, I made a huge progress. And what is very important, I have fun.
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dota2-rpc-client
Allows you to observe the status of your DotA 2 (Defense of the Ancients 2) match within the Discord, through the Rich Presence service. 🎮
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XPLPC
Cross Platform Lite Procedure Call - Support Linux, macOS, Windows, iOS, Android, Web Assembly, Flutter, Kotlin, Python and More
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Sevalla
Deploy and host your apps and databases, now with $50 credit! Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more!
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++ RPC discussion
C++ RPC related posts
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Reverse Engineering Protobuf Definitions from Compiled Binaries
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Write C++ as easy as Golang with coost
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Build and Deploy a gRPC-Web App Using Rust Tonic and React
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The Rise and Fall of Corba (2006)
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How to arrange a bunch of variables into one array of bytes in memory?
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Delimiting a Binary File/ Parsing a Binary File
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Asio is great if you’re building a library/application with non-Asio API. But building Asio APIs using async compositions is too messy. Anybody else agree ?
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A note from our sponsor - JetBrains
surveys.jetbrains.com | 2 Sep 2025
Index
What are some of the best open-source RPC projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Protobuf | 68,919 |
| 2 | aria2 | 38,282 |
| 3 | FlatBuffers | 24,677 |
| 4 | brpc | 17,280 |
| 5 | coost | 4,147 |
| 6 | ice | 2,130 |
| 7 | rpclib | 1,782 |
| 8 | libjson-rpc-cpp | 973 |
| 9 | erpc | 872 |
| 10 | zpp_bits | 872 |
| 11 | smf | 734 |
| 12 | shadesmar | 620 |
| 13 | areg-sdk | 301 |
| 14 | packio | 153 |
| 15 | dota2-rpc-client | 56 |
| 16 | XPLPC | 45 |
| 17 | Unpadded | 18 |
| 18 | eth | 3 |
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