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Top 23 C++ Qt5 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.
This is very cool, and looks like it targets you wanting to look stuff up and I will probably use it at some point.
But I feel that anyone looking at this and thinking "oh that's cool" should also try installing Stellarium (https://stellarium.org/). It lets you see what you can see in the night sky from any location/time on Earth, and is really useful for helping you identify what you're seeing in the night sky.
I don't mean to distract from this, because it's also great. It's just a second tool that anyone with a passing interest in astronomy should be aware of.
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Project mention: OpenSCAD: The Programmer's Solid 3D CAD Modeller | news.ycombinator.com | 2024-09-14
Multi thread support is an experimental feature available on nightly build (and needing to be enabled). The bug tracking it is interesting to read, it has been a long journey... https://github.com/openscad/openscad/issues/391
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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: 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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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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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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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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linuxdeployqt
Makes Linux applications self-contained by copying in the libraries and plugins that the application uses, and optionally generates an AppImage. Can be used for Qt and other applications
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cpeditor
The IDE for competitive programming :tada: | Fetch, Code, Compile, Run, Check, Submit :rocket:
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otter-browser
Otter Browser aims to recreate the best aspects of the classic Opera (12.x) UI using Qt5
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Project mention: android VS nitroshare-desktop - a user suggested alternative | libhunt.com/r/trebleshot/android | 2024-09-13
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pencil
Pencil2D is an easy, intuitive tool to make 2D hand-drawn animations. Pencil2D is open source and cross-platform. (by pencil2d)
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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).
C++ Qt5 discussion
C++ Qt5 related posts
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Show HN: LightCombatManager 3.0 – A simple combat manager for d20-based RPGs
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Open Source Windows Notepad on the Web
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QOwnNotes
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Free parametric bum bag pattern for your delectation
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I wrote a very basic python code chess engine (it makes random moves only), but I'm having issues with it getting "Stuck" on moves in Banksiagui after a few moves, but when playing a computer in Banksiagui it has no issues, and with CuteChess it never has any issues playing a computer or a person.
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Is there a fix for Qt application theming on Ubuntu/Gnome + Wayland?
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Arena secrets by HSReplay and Arena Tracker
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A note from our sponsor - CodeRabbit
coderabbit.ai | 28 Apr 2025
Index
What are some of the best open-source Qt5 projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | NotepadNext | 9,949 |
| 2 | stellarium | 8,590 |
| 3 | openscad | 7,783 |
| 4 | PrismLauncher | 6,756 |
| 5 | PlotJuggler | 4,757 |
| 6 | opentrack | 4,055 |
| 7 | notes | 3,988 |
| 8 | nodeeditor | 3,274 |
| 9 | seer | 3,122 |
| 10 | apkstudio | 2,996 |
| 11 | Qt | 2,678 |
| 12 | qimgv | 2,615 |
| 13 | openauto | 2,592 |
| 14 | linuxdeployqt | 2,302 |
| 15 | qView | 2,283 |
| 16 | Qt-Advanced-Docking-System | 2,084 |
| 17 | cpeditor | 1,920 |
| 18 | otter-browser | 1,881 |
| 19 | aspia | 1,696 |
| 20 | Guitar | 1,613 |
| 21 | nitroshare-desktop | 1,605 |
| 22 | mayo | 1,591 |
| 23 | pencil | 1,549 |
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