c-plus-plus — open-source software health

npm

99Exceptionalhealth index

electron/electron

:electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS

C++ · TypeScript★ 123.1K↓ 24.1M/moSep 16, 2026

MITSep 16, 2026 · metrics 2.10.0

—

98Exceptionalhealth index

nextcloud/desktop

💻 Desktop sync client for Nextcloud

C++ · Swift★ 3,872Sep 19, 2026

GPL-2.0Sep 19, 2026 · metrics 2.10.0

npm · PyPI

97Exceptionalhealth index

Project-OSRM/osrm-backend

Open Source Routing Machine - C++ backend

C++ · Gherkin★ 8,016↓ 14.5K/moAug 28, 2026

BSD-2-ClauseAug 28, 2026 · metrics 2.10.0

PyPI

97Exceptionalhealth index

Slicer/Slicer

Multi-platform, free open source software for visualization and image computing.

C++ · Python★ 2,625Sep 12, 2026

Custom licenseSep 12, 2026 · metrics 2.10.0

Maven · RubyGems

97Exceptionalhealth index

unicode-org/icu

The home of the ICU project source code.

C++ · Java · C★ 3,601Sep 14, 2026

Custom licenseSep 14, 2026 · metrics 2.10.0

PyPI

96Exceptionalhealth index

AcademySoftwareFoundation/OpenImageIO

Reading, writing, and processing images in a wide variety of file formats, using a format-agnostic API, aimed at VFX applications.

C++★ 2,387↓ 238.5K/moOct 20, 2026

Apache-2.0Oct 20, 2026 · metrics 2.10.0

npm

94Exceptionalhealth index

OpenRCT2/OpenRCT2

An open source re-implementation of RollerCoaster Tycoon 2 🎢

C++★ 16.3K↓ 943/moOct 3, 2026

GPL-3.0Oct 3, 2026 · metrics 2.10.0

PyPI

94Exceptionalhealth index

QMCPACK/qmcpack

Main repository for QMCPACK, an open-source production level many-body ab initio Quantum Monte Carlo code for computing the electronic structure of atoms, molecules, and solids with full performance portable GPU support

C++ · Python★ 403Sep 12, 2026

Custom licenseSep 12, 2026 · metrics 2.10.0

PyPI

94Exceptionalhealth index

SimpleITK/SimpleITK

SimpleITK: a layer built on top of the Insight Toolkit (ITK), intended to simplify and facilitate ITK's use in rapid prototyping, education and interpreted languages.

C++ · Python★ 1,085Sep 17, 2026

Apache-2.0Sep 17, 2026 · metrics 2.10.0

Maven

94Exceptionalhealth index

fmtlib/fmt

A modern formatting library

C++★ 25.8KSep 16, 2026

MITSep 16, 2026 · metrics 2.10.0

PyPI

94Exceptionalhealth index

scikit-build/cmake-python-distributions

This project provides the infrastructure to build CMake Python wheels.

Python · CMake★ 137↓ 18.9M/moAug 27, 2026

Apache-2.0Aug 27, 2026 · metrics 2.10.0

PyPI

94Exceptionalhealth index

stack-of-tasks/pinocchio

A fast and flexible implementation of Rigid Body Dynamics algorithms and their analytical derivatives

C++★ 3,739Sep 17, 2026

BSD-2-ClauseSep 17, 2026 · metrics 2.10.0

npm · crates.io

94Exceptionalhealth index

versatica/mediasoup

Cutting Edge WebRTC Video Conferencing

C++ · Rust · TypeScript★ 7,347↓ 270.4K/moAug 28, 2026

ISCAug 28, 2026 · metrics 2.10.0

—

93Exceptionalhealth index

monero-project/monero

Monero: the secure, private, untraceable cryptocurrency

C++ · C★ 10.9KSep 20, 2026

Custom licenseSep 20, 2026 · metrics 2.10.0

PyPI

93Exceptionalhealth index

scikit-build/scikit-build

Improved build system generator for CPython C, C++, Cython and Fortran extensions

Python · CMake★ 534↓ 1.2M/moSep 12, 2026

Custom licenseSep 12, 2026 · metrics 2.10.0

Maven

91Excellenthealth index

aeron-io/aeron

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Java · C · C++★ 8,927Oct 19, 2026

Apache-2.0Oct 19, 2026 · metrics 2.10.0

—

91Excellenthealth index

mapnik/mapnik

Mapnik is an open source toolkit for developing mapping applications

C++★ 3,961Sep 18, 2026

LGPL-2.1Sep 18, 2026 · metrics 2.10.0

PyPI

90Excellenthealth index

scikit-build/ninja-python-distributions

This project provides the infrastructure to build Ninja Python wheels.

Python★ 89Sep 10, 2026

Apache-2.0Sep 10, 2026 · metrics 2.10.0

—

89Excellenthealth index

aseprite/aseprite

Animated sprite editor & pixel art tool (Windows, macOS, Linux)

C++★ 39KAug 25, 2026

No licenseAug 25, 2026 · metrics 2.10.0

—

89Excellenthealth index

openucx/ucx

Unified Communication X (mailing list - https://elist.ornl.gov/mailman/listinfo/ucx-group)

C · C++★ 1,723Oct 12, 2026

Custom licenseOct 12, 2026 · metrics 2.10.0

npm · PyPI

88Excellenthealth index

Esri/lerc

Limited Error Raster Compression

C++★ 215↓ 5M/moSep 16, 2026

Apache-2.0Sep 16, 2026 · metrics 2.10.0

—

87Excellenthealth index

Haivision/srt

Secure, Reliable, Transport

C++★ 3,599Sep 14, 2026

MPL-2.0Sep 14, 2026 · metrics 2.10.0

PyPI

87Excellenthealth index

confluentinc/librdkafka

The Apache Kafka C/C++ library

C★ 1,047Sep 15, 2026

Custom licenseSep 15, 2026 · metrics 2.10.0

npm · PyPI

87Excellenthealth index

google-ai-edge/mediapipe

Cross-platform, customizable ML solutions for live and streaming media.

C++★ 37KSep 16, 2026

Apache-2.0Sep 16, 2026 · metrics 2.10.0

npm

87Excellenthealth index

neutralinojs/neutralinojs

Portable and lightweight cross-platform desktop application development framework

C · C++★ 8,640Sep 18, 2026

Custom licenseSep 18, 2026 · metrics 2.10.0

PyPI

87Excellenthealth index

openmeeg/openmeeg

A C++ package for low-frequency bio-electromagnetism solving forward problems in the field of EEG and MEG.

C++ · C★ 87↓ 4,159/moOct 1, 2026

Custom licenseOct 1, 2026 · metrics 2.10.0

—

87Excellenthealth index

particle-iot/device-os

Device OS (Firmware) for Particle Devices

C++ · C★ 1,076Sep 14, 2026

LGPL-3.0Sep 14, 2026 · metrics 2.10.0

—

86Excellenthealth index

ermig1979/Simd

C++ image processing and machine learning library with using of SIMD: SSE, AVX, AVX-512, AMX for x86/x64, NEON, SVE for ARM, HVX for Hexagon

C++★ 2,274Oct 18, 2026

MITOct 18, 2026 · metrics 2.10.0

—

86Excellenthealth index

prisms-center/phaseField

PRISMS-PF: An Open-Source Phase-Field Modeling Framework

C++★ 343Sep 13, 2026

Custom licenseSep 13, 2026 · metrics 2.10.0

—

86Excellenthealth index

wxWidgets/wxWidgets

Cross-Platform C++ GUI Library

C++ · Objective-C★ 7,268Sep 19, 2026

No licenseSep 19, 2026 · metrics 2.10.0

#c-plus-plus