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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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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.
You may be interested in the Open Asset Import Library. I recently replaced my own gltf import with this and it's been a real breeze, and a good reference for basing my own internal models on. Lots of supported file types and language ports.
If you're going to go to the effort of writing a custom file format, you may as well just write your own Blender export script so that you have the data you want right from the start. If you aren't familiar with it, check out the IQM animation format, which is pretty easy to understand. It has examples of how to load the format, as well as the actual export .py scripts that it uses to export from blender.