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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.
If you're learning a C++ build system from scratch, consider Meson as well. It's much easier to get started with, and in my opinion it's much cleaner and nicer than CMake. The downside is that a lot more projects use CMake, so you may have to spend more time integrating a third-party codebase into a Meson project.
I use the emoji plugin for KRunner (https://github.com/alex1701c/EmojiRunner) and it's fantastic. Also, it comes with handy shortcuts for copying to clipoard or pasting in the "currently active" text field.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.