Here is a list of gallery scripts that can work with
vBulletin:
Some integrations are full, in that they account for skins, but some are not. Some galleries are gallery-like, in that they format display, no uploader, while others have an uploader. Some may, or may not, require two logins. It is, of course, up to you to check what features are present in whatever gallery you choose.
This list is provided as-is: no guarantees, no endorsements.