Custom template available across multiple site collections

I have created a custom site template which I need to be available across multiple site collections. Is there a global area where I can put the .wsp file so that I can use it within any site collection.

I also have a custom document library which I need to be available from with the site made from the custom site template mentioned above - Is there a global area where I can put the .stp file so that I can use it within any site within any site collection.

thanks