Are there Shared Libraries of Machnical and Electronic Parts

[eldonb]

Are there Shared Libraries of Mechanical and Electronic Parts Available?

My AC3D models are generally not as artistic as most that I have seen
here on the AC3D galleries, but they are used to show concepts of
mechanical assemblies, machined parts and electronic circuit boards.

I have created most of my models from scratch and or from a few
libraries that I have created. With the many components that could
be used, it would be great if shared libraries/locations were published.

Also, Are there any standards being used for scale and orientation?

Thanks,
Eldon Brown