@Grok - find Revit families agregators (websites) where the models can be downloaded from (the trusted ones). Provide directs links. Select based on user reviews and popularity.
These are the ones that actually get used in offices, based on how often they come up in user reviews, BIM manager threads, and download volume. Manufacturer-hosted content is generally safer than random community uploads.
Best overall (manufacturer / certified)
BIMobject — largest library, official manufacturer families, Revit versions clearly labelled. Default starting point for most firms.
BIMsmith — strong in the US, manufacturer content, decent parametric families, easy filtering by Revit version.
BIM&CO — solid European manufacturer content, properties are usually better filled out than average.
Polantis — free BIM objects, popular in Europe, mixed but usable if you check the family before loading it.
ARCAT — long-running construction product library with Revit/BIM downloads next to specs.
Modlar — manufacturer BIM + product data; useful when you need a specific branded object.
Community / volume (popular, quality varies)
RevitCity — still the most popular community dump. User ratings help, but a lot of old, over-modelled, or poorly nested families. Check file size and parameters before you trust it.
Most of these need a free account. That is normal.
Prefer manufacturer-published families over anonymous “100k families pack” sites. Those packs are where you get bloated geometry, missing params, and the occasional nasty file.
Always match Revit year, and audit (file size, nested families, imported CAD, materials) before adding anything to a project or office library.
For a specific product, the manufacturer’s own site is often more trustworthy than the aggregator copy.
If you say your region (US / UK / EU) and discipline (arch / struct / MEP), the list can be narrowed to what people in that market actually keep in their library.