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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.
https://github.com/lock3/meta/wiki/Metaprogramming-Introductory-Tutorial for a fork of clang with the reflection & metaclass feature
I have user-defined attributes in Circle: https://github.com/seanbaxter/circle/blob/master/reflection/README.md#user-attributes
I use them to automatically generate an ImGui interface for controlling a shadertoy here: https://github.com/seanbaxter/shaders/blob/master/README.md#user-attributes-and-dear-imgui
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.