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Top 22 C++ Cxx Projects
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JetBrains
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kfr
Fast, modern C++ DSP framework, FFT, Sample Rate Conversion, FIR/IIR/Biquad Filters (SSE, AVX, AVX-512, ARM NEON)
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log4cplus
log4cplus is a simple to use C++ logging API providing thread-safe, flexible, and arbitrarily granular control over log management and configuration. It is modelled after the Java log4j API.
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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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monero-lws
Monero Light Wallet Server (scans monero viewkeys and implements mymonero API). Fast LMDB backend.
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matio-cpp
A C++ wrapper of the matio library, with memory ownership handling, to read and write .mat files.
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core
A comprehensive set of composable foundational C++ libraries and CMake utilities to power Sourcemeta projects (by sourcemeta)
Project mention: Ask HN: What are you working on (September 2024)? | news.ycombinator.com | 2024-09-29I'm working on JSON BinPack (https://jsonbinpack.sourcemeta.com), a binary serialization format for JSON (think of it as a Protobuf alternative) with a strong focus on space-efficiency for reducing costs when transferring structured data over 5G and satellite transceivers for robotics, IoT, automotive, etc.
If you work at any of those industries and pay a lot for data transfer, please reach out!
It was originally designed during my (award-winning!) research at the University of Oxford (https://www.jviotti.com/dissertation.pdf), and it was proven to be more space-efficient than any tested alternative in every single tested case (https://arxiv.org/abs/2211.12799), beating Protocol Buffers for up to ~75%.
While designing it was already difficult, implementing a C++ production-ready version has proven to be very tricky, leading me to branch off to various other pre-requisite projects, like an ultra-fast JSON Schema compiler for nano-second schema validation (https://github.com/sourcemeta/jsontoolkit) (for which I'm publishing a paper soon).
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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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gtl
A collection of useful well-commented, self-contained, simple, and/or interesting C++ classes (by gpdaniels)
Résumé/CV: https://gpdaniels.com/ or https://www.linkedin.com/in/gpdaniels/
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Hippy.Flex
Hippy.Flex is a lightweight flex layout engine implemented in C++ and used as layout component for Hippy framework in android and ios platform.
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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++ Cxx discussion
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A note from our sponsor - JetBrains
surveys.jetbrains.com | 1 Sep 2025
Index
What are some of the best open-source Cxx projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | pycdc | 3,923 |
| 2 | kfr | 1,760 |
| 3 | log4cplus | 1,705 |
| 4 | hypervisor | 1,420 |
| 5 | QXlsx | 1,349 |
| 6 | MongoDB C++ Driver | 1,077 |
| 7 | fast_io | 790 |
| 8 | libgrape-lite | 426 |
| 9 | RisohEditor | 421 |
| 10 | LMDB++ | 278 |
| 11 | idyntree | 206 |
| 12 | Feral | 143 |
| 13 | gta5view | 96 |
| 14 | monero-lws | 92 |
| 15 | matio-cpp | 67 |
| 16 | TinyErode | 57 |
| 17 | core | 51 |
| 18 | XPLPC | 45 |
| 19 | webxx | 30 |
| 20 | gtl | 28 |
| 21 | yaal | 15 |
| 22 | Hippy.Flex | 1 |
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