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Top 23 C++ open-source Projects
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I noticed that Godot Engine Apple Vision OS support is merged today. <3
https://github.com/godotengine/godot/pull/105628
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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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cocos-engine
Cocos simplifies game creation and distribution with Cocos Creator, a free, open-source, cross-platform game engine. Empowering millions of developers to create high-performance, engaging 2D/3D games and instant web entertainment.
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Project mention: Mumble: An AI app with hands-free journaling and mood detection | news.ycombinator.com | 2024-10-30
Kind of a bad name given the existence of https://www.mumble.info/
Which is a large OSS voice server
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Project mention: Endless Sky: Open-Source Space Exploration, Trading, and Combat Game | news.ycombinator.com | 2024-09-29
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openmw
OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/
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Panda3D
Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
A GitHub repository (like this one)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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warzone2100
Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. A 100% free and open source real-time strategy game for Windows, macOS, Linux, BSD+
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Collabora Online
Collabora Online is a collaborative online office suite based on LibreOffice technology. This is also the source for the Collabora Office apps for iOS and Android.
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Project mention: Gem5: Advanced Computer-System Architecture Simulator | news.ycombinator.com | 2024-08-06
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Incredible work! My son really had a blast scrolling around and exploring last night.
Did you take any inspiration from Celestia (https://celestiaproject.space)? It's been over 15 years since I last really used it (and starts with defaults not geared towards visualizing just our local solar system) but seems to have a lot of the features others have suggested. Might be useful to poke around and see how they solved things like time adjustments, selecting POIs, etc.
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I want my desktop app https://ossia.io which uses ffmpeg to be able to send & receive video to another computer over internet without having to fiddle with opening ports on each other's routers. This combined with a server like vdo.ninja solves that.
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ITK
Insight Toolkit (ITK) -- Official Repository. ITK builds on a proven, spatially-oriented architecture for processing, segmentation, and registration of scientific images in two, three, or more dimensions.
> If you think your project will have more than half a dozen developers then you should probably start thinking about something like...
CMake was created in 2000 with large, cross-platform projects involving multiple organizations in mind. The development was funded by the National Library of Medicine (NLM) for the ITK project (https://github.com/InsightSoftwareConsortium/ITK). As of 2025, ITK consists of millions of lines of code and has received contributions from hundreds of developers. Other projects of similar scale include VTK and ParaView.
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If you like using Qt but you also want a more modernize C++ version of it, you can try https://github.com/copperspice/copperspice/ and I'm pretty sure its license have you covered.
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spot_mini_mini
Dynamics and Domain Randomized Gait Modulation with Bezier Curves for Sim-to-Real Legged Locomotion.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
C++ open-source discussion
C++ open-source related posts
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Introducing DICI : A Fast and Efficient Lossless Image Compression Format
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VisionOS Godot Engine support merged
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Native visionOS platform support in Godot
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(Godot Engine) Native VisionOS Platform Support
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Redesigning the Reference Component on Gabe the Bear Blog
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Godot 4.4
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EA Just Open Sourced Command and Conquer, Red Alert, Renegade and Generals
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A note from our sponsor - InfluxDB
www.influxdata.com | 25 Jun 2025
Index
What are some of the best open-source open-source projects in C++? This list will help you:
# | Project | Stars |
---|---|---|
1 | Godot | 98,203 |
2 | cocos-engine | 8,768 |
3 | Mumble | 6,990 |
4 | endless-sky | 6,643 |
5 | openmw | 5,763 |
6 | Panda3D | 4,810 |
7 | GamePlay | 4,635 |
8 | webots | 3,632 |
9 | warzone2100 | 3,401 |
10 | SpartanEngine | 2,475 |
11 | Collabora Online | 2,252 |
12 | gem5 | 2,046 |
13 | Celestia | 2,005 |
14 | score | 1,634 |
15 | OpenScan | 1,589 |
16 | ITK | 1,508 |
17 | copperspice | 1,195 |
18 | MxEngine | 1,190 |
19 | Beeftext | 1,097 |
20 | TerraForge3D | 1,066 |
21 | Unvanquished | 1,031 |
22 | spot_mini_mini | 849 |
23 | luascript | 690 |