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Top 23 Qt5 Open-Source Projects
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stellarium
Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows and macOS. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.
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PrismLauncher
A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)
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Project mention: Show HN: FluidCAD – Parametric CAD with JavaScript | news.ycombinator.com | 2026-04-10
I'll throw my hat in on the feedback... looks great!
https://github.com/openscad/openscad/pull/4478#issuecomment-...
My pet use case is: "My naive approach as a programmer would be: `pen := new Pen(q,r,s,t); box := new Box( pen.L, pen.W, pen.H )`" along with being able to sometimes work with the whole pen, and sometimes touch the pen vs. the cap separately.
Since it's all javascript, it seems like there's a chance that this use case would work (ie: `p = Pen(...).render().getWidth()`)? Additionally, your intermediate step screenshots really makes it seem like a SketchUp-ish GUI would be perfect! Obviously a ton of work, but SketchUp's "grab face + extrude / push", but if it were "sticky" to the underlying parametric components seems like it'd be an awesome combo... something like group/components, but backed by code instead of GUI-only (or GUI-centric) editing.
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PyQt-Fluent-Widgets
A fluent design widgets library based on C++ Qt/PyQt/PySide. Make Qt Great Again.
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There's already one available at https://sqlitestudio.pl/, which I've been using for many years, and it's very stable.
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Project mention: LabPlot: Free, open source and cross-platform Data Visualization and Analysis | news.ycombinator.com | 2025-08-22
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openshot-qt
OpenShot Video Editor is an award-winning free and open-source video editor for Linux, Mac, and Windows, and is dedicated to delivering high quality video editing and animation solutions to the world.
> A simple but powerful video editor that gets the job done. Works on any platform.
> Enter your email. Join waitlist
> 59284 people already joined
I would have expected a bit more from the main page.
For the FOSS video editing software out there, I tried out Shotcut (https://www.shotcut.org/) and OpenShot (https://www.openshot.org/), though both of them were either a bit unpolished or unstable, with the occasional crash along the way.
I had a way better experience with kdenlive, which was my main video editor for a bit, has the basic features I'd expect, as well as decent codec support: https://kdenlive.org/
As for other options, DaVinci Resolve still feels like the more professional software suite that you'd go for, sans the cost, albeit the UI can be a bit awkward in places to someone used to the likes of kdenlive/Sony Vegas: https://www.blackmagicdesign.com/products/davinciresolve
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Project mention: Webcam head tracking, webcam to control in‑game FOV | news.ycombinator.com | 2026-06-02
opentrack would be the one to beat these days: https://github.com/opentrack/opentrack
It's completely replaced my TrackIR 5, since it averts the need to wear headphones and dig out the tracking bracket every time I want to use it, and the accuracy feels about the same.
I found head tracking pretty much becomes second-nature after a while - to the point at which it feels weird to play first-person sims without it. Not quite as fancy as VR, but much more comfortable and much more practical.
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Yes, my FOSS note-taking app[1] used to be pure Qt Widgets. Recently, I've added the Kanban feature that uses QML (this and the editor settings should be the only parts in QML, if I remember correctly).
[1] https://github.com/nuttyartist/notes
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apkstudio
Open-source, cross platform Qt6 based IDE for reverse-engineering Android application packages. It features a friendly IDE-like layout including code editor with syntax highlighting support for *.smali code files.
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If you don't keep it as a toy, it can get out of hand quickly. For example, here's the partial implementation of QWidget, almost 500k of code: https://github.com/qt/qtbase/blob/dev/src/widgets/kernel/qwi...
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View the Project on GitHub
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awesome-qt-qml
A curated list of awesome Qt and QML libraries, resources, projects, and shiny things.
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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).
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Index
What are some of the best open-source Qt5 projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | stellarium | 9,646 |
| 2 | PrismLauncher | 9,538 |
| 3 | openscad | 9,513 |
| 4 | PyQt-Fluent-Widgets | 7,936 |
| 5 | persepolis | 7,354 |
| 6 | letos | 6,567 |
| 7 | PlotJuggler | 5,938 |
| 8 | openshot-qt | 5,844 |
| 9 | opentrack | 4,871 |
| 10 | notes | 4,248 |
| 11 | apkstudio | 4,006 |
| 12 | nodeeditor | 3,649 |
| 13 | seer | 3,394 |
| 14 | qView | 3,321 |
| 15 | QDarkStyleSheet | 3,078 |
| 16 | qimgv | 3,045 |
| 17 | Qt | 3,027 |
| 18 | novelWriter | 2,953 |
| 19 | openauto | 2,872 |
| 20 | awesome-qt-qml | 2,565 |
| 21 | examples | 2,563 |
| 22 | git-cola | 2,533 |
| 23 | Qt-Advanced-Docking-System | 2,464 |
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