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CADBase
Discontinued The platform for publishing and sharing information about drawings and manufacturers.
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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 can add your custom categories in SolidWorks Toolbox or Autodesk Inventor and dump your library there. If you need FreeCAD, there is https://cadbase.rs (cloud), and FreePDM. Also Physna, 3dfindit from cadenas etc, but they are paid.
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.