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C++ repos to contribute to

OpenSrc lists 163 C++ repositories with open issues for new contributors, and 88 of them are first-PR friendly. Between them they have 3,243 open good first issues and 2,297 help-wanted issues. The median welcome score is 77/100, and the best-scored right now are FreeCAD/FreeCAD, organicmaps/organicmaps and x64dbg/x64dbg. Most are about Graphics, OS & Systems and Game Dev.

163 repos by best score

Filter these in the directory

  • FreeCAD/FreeCAD

    Official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.

    152good first issues+141 help wanted
    • C++
    • Field: Graphics
    • Field: OS
    • Stars:33.8K
    • LGPL-2.1
    • CONTRIBUTING
    • replies in ~12h
    Score99 out of 100 contributor score, very welcomingFirst-PR friendly

  • organicmaps/organicmaps

    🍃 Organic Maps is a free Android & iOS offline maps app for more than 6M travelers, tourists, hikers, and…

    172good first issues
    • C++
    • Field: Mobile
    • Stars:15.5K
    • CONTRIBUTING
    • replies in ~4h
    Score98 out of 100 contributor score, very welcomingFirst-PR friendly

  • x64dbg/x64dbg

    An open-source user mode debugger for Windows. Optimized for reverse engineering and malware analysis.

    44good first issues
    • C++
    • Field: Security
    • Stars:49.6K
    • CONTRIBUTING
    • replies in ~6h
    Score97 out of 100 contributor score, very welcomingFirst-PR friendly

  • CleverRaven/Cataclysm-DDA

    Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.

    55good first issues+89 help wanted
    • C++
    • Field: Game Dev
    • Stars:13.3K
    • CONTRIBUTING
    • replies in ~4h
    Score97 out of 100 contributor score, very welcomingFirst-PR friendly

  • microsoft/terminal

    The new Windows Terminal and the original Windows console host, all in the same place!

    15good first issues+483 help wanted
    • C++
    • Field: CLI Tools
    • Stars:105K
    • MIT
    • CONTRIBUTING
    • replies in ~7h
    Score96 out of 100 contributor score, very welcomingFirst-PR friendly

  • diasurgical/DevilutionX

    Diablo build for modern operating systems

    23good first issues+23 help wanted
    • C++
    • Field: Game Dev
    • Field: OS
    • Stars:9.8K
    • CONTRIBUTING
    • replies in ~1h
    Score96 out of 100 contributor score, very welcomingFirst-PR friendly

  • NixOS/nix

    Nix, the purely functional package manager

    26good first issues
    • C++
    • Stars:17.8K
    • LGPL-2.1
    • CONTRIBUTING
    • replies in ~9h
    Score95 out of 100 contributor score, very welcomingFirst-PR friendly

  • wesnoth/wesnoth

    An open source, turn-based strategy game with a high fantasy theme.

    73good first issues
    • C++
    • Field: Game Dev
    • Stars:6.9K
    • GPL-2.0
    • CONTRIBUTING
    • replies in ~2h
    Score95 out of 100 contributor score, very welcomingFirst-PR friendly

  • PixarAnimationStudios/OpenUSD

    Universal Scene Description

    18good first issues+23 help wanted
    • C++
    • Stars:7.5K
    • CONTRIBUTING
    • replies in ~10h
    Score93 out of 100 contributor score, very welcomingFirst-PR friendly

  • ArduPilot/ardupilot

    ArduPlane, ArduCopter, ArduRover, ArduSub source

    47good first issues
    • C++
    • Field: Embedded
    • Stars:16K
    • GPL-3.0
    • CONTRIBUTING
    • replies in ~2d
    Score92 out of 100 contributor score, very welcomingFirst-PR friendly

  • PointCloudLibrary/pcl

    Point Cloud Library (PCL)

    54good first issues+28 help wanted
    • C++
    • Field: DevOps
    • Field: Machine Learning
    • Stars:11.1K
    • CONTRIBUTING
    • replies in ~17h
    Score92 out of 100 contributor score, very welcomingFirst-PR friendly

  • luanti-org/luanti

    Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation

    18good first issues+10 help wanted
    • C++
    • Field: Game Dev
    • Stars:13.7K
    • CONTRIBUTING
    • replies in ~5h
    Score91 out of 100 contributor score, very welcomingFirst-PR friendly

  • AcademySoftwareFoundation/OpenImageIO

    Reading, writing, and processing images in a wide variety of file formats, using a format-agnostic API, aimed…

    15good first issues+18 help wanted
    • C++
    • Field: Backend
    • Stars:2.4K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~12h
    Score91 out of 100 contributor score, very welcomingFirst-PR friendly

  • NVIDIA/cccl

    CUDA Core Compute Libraries

    17good first issues+9 help wanted
    • C++
    • Field: Graphics
    • Field: Scientific Computing
    • Stars:2.5K
    • CONTRIBUTING
    • replies in ~12m
    Score90 out of 100 contributor score, very welcomingFirst-PR friendly

  • react/react-native

    A framework for building native applications using React

    8good first issues
    • C++
    • Field: Mobile
    • Stars:126.8K
    • MIT
    • CONTRIBUTING
    • replies in ~1m
    Score89 out of 100 contributor score, very welcomingFirst-PR friendly

  • project-chip/connectedhomeip

    Matter (formerly Project CHIP) creates more connections between more objects, simplifying development for…

    11good first issues
    • C++
    • Field: Embedded
    • Stars:9K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~6h
    Score89 out of 100 contributor score, very welcomingFirst-PR friendly

  • nextcloud/desktop

    💻 Desktop sync client for Nextcloud

    29good first issues+10 help wanted
    • C++
    • Field: OS
    • Stars:3.9K
    • GPL-2.0
    • CONTRIBUTING
    • replies in ~5h
    Score89 out of 100 contributor score, very welcomingFirst-PR friendly

  • OpenChemistry/avogadrolibs

    Avogadro libraries provide 3D rendering, visualization, analysis and data processing useful in computational…

    12good first issues+11 help wanted
    • C++
    • Field: Scientific Computing
    • Field: Graphics
    • Stars:677
    • BSD-3-Clause
    • CONTRIBUTING
    • replies in ~8h
    Score89 out of 100 contributor score, very welcomingFirst-PR friendly

  • azerothcore/azerothcore-wotlk

    Complete Open Source and Modular solution for MMO

    20good first issues+12 help wanted
    • C++
    • Field: Game Dev
    • Stars:9K
    • GPL-2.0
    • CONTRIBUTING
    Score88 out of 100 contributor score, very welcomingFirst-PR friendly

  • OpenTTD/OpenTTD

    OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe

    15good first issues
    • C++
    • Field: Game Dev
    • Field: Scientific Computing
    • Stars:8.3K
    • CONTRIBUTING
    • replies in ~24m
    Score88 out of 100 contributor score, very welcomingFirst-PR friendly

  • ihhub/fheroes2

    fheroes2 is a recreation of Heroes of Might and Magic II game engine

    18good first issues+22 help wanted
    • C++
    • Field: Game Dev
    • Stars:3.5K
    • GPL-2.0
    • CONTRIBUTING
    • replies in ~2h
    Score88 out of 100 contributor score, very welcomingFirst-PR friendly

  • MarlinFirmware/Marlin

    Marlin is a firmware for RepRap 3D printers optimized for both 8 and 32 bit microcontrollers. Marlin…

    4good first issues+6 help wanted
    • C++
    • Field: Embedded
    • Field: Graphics
    • Stars:17.6K
    • GPL-3.0
    • CONTRIBUTING
    • replies in ~5h
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • google/benchmark

    A microbenchmark support library

    10good first issues+43 help wanted
    • C++
    • Stars:10.4K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~4h
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • meshtastic/firmware

    The official firmware for Meshtastic, an open-source, off-grid mesh communication system.

    9good first issues+42 help wanted
    • C++
    • Field: Embedded
    • Field: Networking
    • Stars:8.4K
    • GPL-3.0
    • CONTRIBUTING
    • replies in ~35h
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • cyberbotics/webots

    Webots Robot Simulator

    8good first issues
    • C++
    • Field: Scientific Computing
    • Field: Machine Learning
    • Stars:4.7K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~23h
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • UZDoom/UZDoom

    UZDoom is a feature centric port for all Doom engine games, based on GZDoom, adding an advanced renderer and…

    18good first issues+6 help wanted
    • C++
    • Field: Game Dev
    • Field: Graphics
    • Stars:2.3K
    • CONTRIBUTING
    • replies in ~4h
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • Icinga/icinga2

    The core of our monitoring platform with a powerful configuration language and REST API.

    44good first issues+9 help wanted
    • C++
    • Field: Observability
    • Field: Backend
    • Stars:2.2K
    • GPL-3.0
    • CONTRIBUTING
    • replies in ~21h
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • serenedb/serenedb

    The First Real-Time Search Analytics Database

    46good first issues
    • C++
    • Field: Databases
    • Field: Data Science
    • Stars:844
    • Apache-2.0
    • CONTRIBUTING
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • stan-dev/math

    The Stan Math Library is a C++ template library for automatic differentiation of any order using forward…

    44good first issues
    • C++
    • Stars:839
    • BSD-3-Clause
    • CONTRIBUTING
    • replies in ~11h
    Score87 out of 100 contributor score, very welcomingFirst-PR friendly

  • defold/defold

    Defold is a completely free to use game engine for development of desktop, console, mobile and web games.

    8good first issues
    • C++
    • Field: Game Dev
    • Field: Web Frontend
    • Stars:6.3K
    • CONTRIBUTING
    • replies in ~21h
    Score86 out of 100 contributor score, very welcomingFirst-PR friendly

Showing 30 of 163 repos