CAD Forum block libary
Thousands of free CAD blocks and symbols (2D+3D) for AutoCAD (DWG), Revit (RFA) and Inventor (IPT). Categorized download and upload.
https://www.cadforum.cz/catalog
Libraries
CAD Hatch, Free AutoCAD Hatch Patterns
A CAD hatch library including a selection of over 297 free AutoCAD hatch patterns. The CAD library includes free Autodesk CAD wood patterns, free stone hatches, brick hatch patterns, geometric patterns and many scales of each design.
https://www.cadhatch.com/