vbGallery does not support vb5 as that product line has not been developed in years. PhotoPost Pro 8.x series and our remaining products all supports vBulletin 5 with header footer style integration much like we do in the previous vbulletin integrations.
As far as who is using there software for what integration I could not tell you for sure since that is something you all as customers do not need to tell us. You only tell us the url your software is running on. Therefore I could not point you to any specific site since we have no such records on our customers like that. All my personal test sites are standalone or xenforo related since that is where the bulk of my testing as of late has been. I personally do not own vB5 therefore no site of my own with that one.