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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.
There are many options but I believe the most popular paradigm is to use immediate mode UIs, like Dear ImGui, and hook them into the rendering engine itself (i.e. translating the UI draw calls to DirectX / Vulkan), with custom textures/fonts/etc. to make the UI feel 'native' to the game.
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.