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Beginner Friendly Open-Source C++

Good First Issues in C++

Explore curated starter issues in high-scoring C++ repositories. Every listed issue belongs to a welcoming repository scored by C-Rank™ on PR merge rates, review responsiveness, and first-timer acceptance.

Updated: Sun, 30 Aug 2026 UTC (Live GitHub Sync)
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Top C++ Repositories with Beginner Issues (20)

Updated Daily via GitHub GraphQL
microsoft
XBOX-Godot-Sample
microsoft/XBOX-Godot-Sample
SElite
227·C++

An example implementation binding the Microsoft GDK, XBOX Services, PlayFab and GameInput to Godot 4. Provides GDExtension and Game references for shipping on XBOX on PC.

#game-development#gamedev#gameinput
94%
Merge Rate
<1h
Review Time
80%
1st-Timers
2 GFI
Scorecard
Awesome-Embedded-Learning-Studio
Tutorial_AwesomeModernCPP
Awesome-Embedded-Learning-Studio/Tutorial_AwesomeModernCPP
SElite
225·C++

A systematic modern C++ tutorial covering C++11-C++23, STL, concurrency, performance optimization, software engineering, embedded systems, networking, GUI, and real-world project practices.

#concurrency#cpp#cpp-tutorial
94%
Merge Rate
1d
Review Time
100%
1st-Timers
2 GFI
Scorecard
p3d-project
persona-3-dual
p3d-project/persona-3-dual
SElite
225·C++

A Nintendo DS demake of Persona 3, developed in C++ using devkitpro.

91%
Merge Rate
5h
Review Time
75%
1st-Timers
8 GFI
Scorecard
ezEngine
ezEngine
ezEngine/ezEngine
SElite
2.0k·C++

An open source C++ game engine.

#3d-game-engine#3d-graphics#c-plus-plus
93%
Merge Rate
11h
Review Time
86%
1st-Timers
5 GFI
Scorecard
CrimsonCrossBunker
Cataclysm-Cleanwater-Bomb
CrimsonCrossBunker/Cataclysm-Cleanwater-Bomb
SElite
62·C++

Cataclysm:Cleanwater Bomb(大灾变:净化协议)是一款基于CDDA Commit221c786e7d实验版的分支。该分支主旨为兼顾真实性与游戏性,保留一定的CDDA风味的同时发展出自己的特色。本分支支持有大量参考文献支撑的符合现实逻辑与玩家直觉的改动,同时反对刻意为玩家游玩增加困难或无法给出可能造成的影响任何处理方案的改动,明确真实性不等于削弱也不等于缺乏游戏性,改动的同时要兼顾游戏性。

93%
Merge Rate
20h
Review Time
100%
1st-Timers
1 GFI
Scorecard
aethersdr
AetherSDR
aethersdr/AetherSDR
SElite
203·C++

Native amateur-radio workstation for FlexRadio (FLEX-6000/8000/Aurora) — Linux, macOS, Windows · Qt6 + C++20

#amateur-radio#cpp#flexradio
87%
Merge Rate
20h
Review Time
79%
1st-Timers
26 GFI
Scorecard
nbcraft-org
nbcraft
nbcraft-org/nbcraft
SElite
590·C++

The ultimate cross-platform mining experience.

#decompilation
91%
Merge Rate
1d
Review Time
86%
1st-Timers
5 GFI
Scorecard
selfpatch
ros2_medkit
selfpatch/ros2_medkit
SElite
252·C++

ros2_medkit - diagnostics gateway for ROS 2 robots. Faults, live data, operations, scripts, locking, triggers, and OTA updates via REST API. No SSH, no custom tooling.

#diagnostics#edge#fleet
93%
Merge Rate
9h
Review Time
100%
1st-Timers
5 GFI
Scorecard
LBALab
lba2-classic-community
LBALab/lba2-classic-community
SElite
104·C++

Community-maintained source port of the original Little Big Adventure 2 (Twinsen’s Odyssey) engine.

90%
Merge Rate
21h
Review Time
100%
1st-Timers
3 GFI
Scorecard
cataclysmbn
Cataclysm-BN
cataclysmbn/Cataclysm-BN
SElite
1.2k·C++

Cataclysm: Bright Nights: A fork/variant of Cataclysm:DDA by CleverRaven with a mod registry at https://mods.cataclysmbn.org/

#c-plus-plus#cataclysm#game
88%
Merge Rate
18h
Review Time
84%
1st-Timers
4 GFI
Scorecard
WayfireWM
wayfire
WayfireWM/wayfire
SElite
3.0k·C++

A modular and extensible wayland compositor

89%
Merge Rate
12h
Review Time
100%
1st-Timers
5 GFI
Scorecard
mcpp-community
mcpp
mcpp-community/mcpp
SElite
109·C++

A modern C++ module-first build tool — written in pure C++23 modules, fully self-hosted / 一个 现代C++ 模块化构建工具 — 纯 C++23 模块编写(已实现自举)

#build-tool#cpp#cpp23
87%
Merge Rate
2d
Review Time
83%
1st-Timers
2 GFI
Scorecard
equalsraf
neovim-qt
equalsraf/neovim-qt
SElite
2.0k·C++

Neovim client library and GUI, in Qt6.

#neovim#neovim-guis#qt
94%
Merge Rate
4h
Review Time
100%
1st-Timers
1 GFI
Scorecard
LadybugDB
ladybug
LadybugDB/ladybug
SElite
1.6k·C++

LadybugDB a graph database

#code-knowledge-base#code-knowledge-graph#cypher
86%
Merge Rate
14h
Review Time
93%
1st-Timers
1 GFI
Scorecard
TailsmanDesign
PocketMage_PDA
TailsmanDesign/PocketMage_PDA
SElite
2.0k·C++

An E-Ink PDA device using the ESP32 S3.

90%
Merge Rate
19h
Review Time
50%
1st-Timers
2 GFI
Scorecard
AcademySoftwareFoundation
rawtoaces
AcademySoftwareFoundation/rawtoaces
SElite
186·C++

RAW to ACES Utility

92%
Merge Rate
3h
Review Time
67%
1st-Timers
3 GFI
Scorecard
zeroc-ice
ice
zeroc-ice/ice
SElite
2.2k·C++

All-in-one solution for creating networked applications with RPC, pub/sub, server deployment, and more.

#hacktoberfest#ice#rpc
92%
Merge Rate
2d
Review Time
80%
1st-Timers
1 GFI
Scorecard
dingusdev
dingusppc
dingusdev/dingusppc
SElite
391·C++

An experimental emulator

#emulation#emulator#macintosh
89%
Merge Rate
7h
Review Time
100%
1st-Timers
1 GFI
Scorecard
QMCPACK
qmcpack
QMCPACK/qmcpack
SElite
398·C++

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-plus-plus#cuda#electronic-structure
90%
Merge Rate
1d
Review Time
86%
1st-Timers
2 GFI
Scorecard
autowarefoundation
vision_pilot
autowarefoundation/vision_pilot
SElite
735·C++

Free and fully open-source L2 ADAS stack powered by End-to-End AI technology

79%
Merge Rate
9h
Review Time
60%
1st-Timers
2 GFI
Scorecard

How to make your first C++ open-source pull request

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