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Top 6 C++ free-software Projects
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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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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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HoverZoom: Chrome plugin sold by original dev, new update included spyware and ads.
As I said, I don't mind if the answer is "we are volunteers who love this", but I do ask that formal webpages presenting a product explains it's funding model. Their github (https://github.com/CelestiaProject/Celestia) is much better at this.
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Hypersomnia
Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱
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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++ free-software discussion
C++ free-software related posts
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KDE going all-in on a Wayland future
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Acronis True Image Costs Performance When Not Used
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Flameshot v13.0.0 Out
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Show HN: The Atlas of Space
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Celestia – real-time 3D visualization of space
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Show HN: Esports shooter on the Web in C++. I rely on floating-point determinism
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The Planets Today
- A note from our sponsor - SaaSHub www.saashub.com | 23 Dec 2025
Index
What are some of the best open-source free-software projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | flameshot | 28,491 |
| 2 | Collabora Online | 2,781 |
| 3 | Celestia | 2,174 |
| 4 | Soundux | 1,837 |
| 5 | Hypersomnia | 1,431 |
| 6 | megaglest-source | 389 |
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