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. Learn more →
Top 23 C++ open-source Projects
-
I noticed that Godot Engine Apple Vision OS support is merged today. <3
https://github.com/godotengine/godot/pull/105628
-
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.
-
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.
-
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
-
Project mention: Endless Sky: Open-Source Space Exploration, Trading, and Combat Game | news.ycombinator.com | 2024-09-29
-
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/
-
Panda3D
Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
A GitHub repository (like this one)
-
-
SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
-
-
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+
-
-
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.
-
Project mention: Gem5: Advanced Computer-System Architecture Simulator | news.ycombinator.com | 2024-08-06
-
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.
-
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.
-
-
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.
-
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.
-
-
-
-
-
spot_mini_mini
Dynamics and Domain Randomized Gait Modulation with Bezier Curves for Sim-to-Real Legged Locomotion.
-
-
SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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++ open-source discussion
C++ open-source related posts
-
Introducing DICI : A Fast and Efficient Lossless Image Compression Format
-
VisionOS Godot Engine support merged
-
Native visionOS platform support in Godot
-
(Godot Engine) Native VisionOS Platform Support
-
Redesigning the Reference Component on Gabe the Bear Blog
-
Godot 4.4
-
EA Just Open Sourced Command and Conquer, Red Alert, Renegade and Generals
-
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 |
Sponsored
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.
www.influxdata.com