Usable alternative registries?

Hi, are there any alternative registries out there that actually supply downloadable crates?
So far my google-fu only lead me to find several “this is how to set up an alternative registry index and this is how you would push crates to it” articles but I could not find any example of such a registry actually being set up in a way that would let me download some demo-crates from it. :confused:
Are there any known examples?

I haven’t heard of any publicly-accessible alternate registries.

The main use-case which comes to mind is if you’re running a company and want to have crates which are only usable internally. In that case, these alternate registries are probably not going to be indexed by google. Companies may blog about them though.