Brain Maps is an online, interactive brain atlas, including both primate and non-primate brains. Brain Maps provides scanned images of sub-micron resolution brain sections. These images are annotated and a database allows for querying and retrieval of data about brain structure and function. Complete brain atlases are available for certain species.
The Brain Maps API is a multiresolution image viewer with customizable label overlays. It is a free service, available for any web site that is free to consumers.