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rssguard
Feed reader (and podcast player) which supports RSS/ATOM/JSON and many web-based feed services.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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assimp
The official Open-Asset-Importer-Library Repository. Loads 40+ 3D-file-formats into one unified and clean data structure.
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xournalpp
Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input from devices such as Wacom Tablets.
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Labrador
EspoTek Labrador is a USB device that transforms your PC or smartphone into a fully-featured electronics lab. This repo holds all of the source code!
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
My project, pingnoo. https://www.pingnoo.com or https://github.com/nedrysoft/pingnoo
I am gladly waiting for some contributors for my RSS Guard - relatively well-known multi-protocol and multi-account feed reader with sync. Used by 2 000 - 10 000 regular users.
You can find our repository here on Github: https://github.com/assimp/assimp
I would suggest xournalpp it uses modern c++ and its codebase is quite simple to understand.
pioneerspacesim
Personally, I like extensions to the standard library for your use case, for example span-lite or fmtlib. Start on the simple issues and respect contributer guidelines.
I have personally contributed to Labrador and The Powder Toy. They were both quite friendly.
I would love to see people contributing cpp code on here : https://github.com/adventuregamestudio/ags
If you're not looking for a popular project, but for a small C++ project where you can contribute to have fun, improve your C++ skills, and get some help, maybe take a look at my educational programming language written in C++17: https://github.com/vvaltchev/mylang
I have another project, which is much more mature and has a ton of documentation for contributors, because I especially care about that aspect, but it's an operating system and most of it is written in C. Its unit tests are written in C++, however. It's called Tilck: https://github.com/vvaltchev/tilck
I come from a group called STE||AR where we develop HPX, "a C++ Standard Library for Parallelism and Concurrency".