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EDStatusPanel
A status monitor for Elite Dangerous, written in PHP. Designed for 1080p screens in the four-panel-view in panel.php, and for 7 inch screens with a resolution of 1024x600 connected to a Raspberry Pi.
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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.
The mod you linked was ran as a separate executable to the game and it likely opened a transparent window over the game when it was running and listened to the memory to know what and where to draw the information you are seeing. The language they likely used was C# or C++. If they are drawing information to the window in different locations over the mobs accurately then I would guess they used a graphics library like OpenGL or something C# specific like monogame.