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Top 23 Qt5 Open-Source 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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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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Project mention: Simple programming language with offline usable browser IDE | news.ycombinator.com | 2025-05-29
I suppose I should blog about this at: https://designinto3d.com/
but I've written a fair number of posts on it at:
https://forum.makerforums.info/search?q=gcodepreview
and it has come up a few times at:
https://community.carbide3d.com/search?q=gcodepreview
and on the OpenSCAD mailing list --- that latter might need to be extended back in time to encompass: https://github.com/openscad/openscad/issues/2017
Glad to answer any questions you might have!
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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)
>- several Minecraft launchers / mod-managers have been tried, but I can't seem to keep my Microsoft account logged in on there, so I eventually just put my password on a sticky note so they could re-auth it whenever needed (fortunately I don't use it for anything else).
https://prismlauncher.org/
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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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Project mention: SQLiteStudio: Create, edit, browse SQLite databases | news.ycombinator.com | 2024-11-24
In few days there will be another 3.4.x branch release (3.4.7), which addresses this exact problem - https://github.com/pawelsalawa/sqlitestudio/issues/5119
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Project mention: Robotics and ROS2 Course by University of Eastern Finland | news.ycombinator.com | 2025-01-19
One of my pet peeves with the algorithm/science ecosystem surrounding ros is that almost all of these algorithms are not usable without ROS. Deep down inside some planning algorithm, you find ros data structures, ros publishers etc. This is poorly designed code. It's like letting raw SQL queries infect an entire ecosystem of libraries. IMO, this pattern is holding robotics back.
Two examples come to mind of packages that do NOT do this:
1. plotjuggler [1], which is a tool for plotting time serious data. It can connect to ROS, but also supports many other communication paradigms, like mqtt, zeroMQ, websockets, custom data and some more I forget.
2. nvblox, which at its core doesn't depend on ROS but instead provides a ros2 compatibility layer.
[1] https://github.com/facontidavide/PlotJuggler
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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.
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Project mention: App Should Have Been a Website (and Probably Your Game Too) | news.ycombinator.com | 2024-12-31
Hi there! Yes, I will switch to a more distinctive icon in the future once I can afford to hire a new designer.
Multiplayer was quoting the correct reason. I also exeplained more about the timeline here: https://github.com/nuttyartist/notes/issues/690#issuecomment...
Tldr: The FOSS version earned a stable revenue through Google Ads placed on the website, since the website ranked high on Google searches. Two years ago, that changed since the website got de-ranked, so I created a different, proprietary version of the app based on the FOSS version but with a totally revamped block editor that I wrote from scratch - that I worked on full-time for a whole 1 year.
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I submitted a bug report for the font:
https://github.com/epasveer/seer/issues/265
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apkstudio
Open-source, cross platform Qt based IDE for reverse-engineering Android application packages.
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QRhi is pretty much the exact same goal than pygfx with a different implementation: https://github.com/qt/qtbase/tree/dev/src/gui/rhi
I've been using it for 4-ish years now in https://ossia.io
Pros:
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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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Project mention: Ubuntu Hoping to Remove Qt 5 Before Ubuntu 26.04 LTS | news.ycombinator.com | 2024-11-01
Qt5 to Qt6 is nothing like Python2 to Python3.
The lessons from (Qt3 to Qt4 and) Qt4 to Qt5 have been learned and moving a large project from Qt5 to Qt6 is not that hard comparatively. There are a few minor deprecated APIs to handle and it's relatively easy over all.
I even have a stable project that is compatible with Qt5 and Qt6 [1] all in a single code base (particularly thanks to the effort of the qtpy[2] library). It's not that hard, and my opinion includes C++ in that assessment.
[1] https://github.com/git-cola/git-cola/
[2] https://github.com/spyder-ide/qtpy
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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).
Qt5 discussion
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Show HN: LightCombatManager 3.0 – A simple combat manager for d20-based RPGs
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The day I taught AI to read code like a Senior Developer
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NovelWriter
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Cxx-Qt: Use Qt from Rust
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Open Source Windows Notepad on the Web
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QOwnNotes
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I have a question, Why I can't connect to other seeders?
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A note from our sponsor - InfluxDB
www.influxdata.com | 24 Jun 2025
Index
What are some of the best open-source Qt5 projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | NotepadNext | 11,141 |
| 2 | stellarium | 8,795 |
| 3 | openscad | 7,953 |
| 4 | PrismLauncher | 7,073 |
| 5 | PyQt-Fluent-Widgets | 6,784 |
| 6 | persepolis | 6,680 |
| 7 | sqlitestudio | 5,994 |
| 8 | PlotJuggler | 5,065 |
| 9 | openshot-qt | 4,845 |
| 10 | opentrack | 4,154 |
| 11 | notes | 4,021 |
| 12 | nodeeditor | 3,344 |
| 13 | seer | 3,163 |
| 14 | apkstudio | 2,996 |
| 15 | QDarkStyleSheet | 2,978 |
| 16 | Qt | 2,726 |
| 17 | qimgv | 2,670 |
| 18 | openauto | 2,643 |
| 19 | examples | 2,517 |
| 20 | novelWriter | 2,438 |
| 21 | awesome-qt-qml | 2,373 |
| 22 | qView | 2,359 |
| 23 | git-cola | 2,354 |
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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