To obtain a multi-site license you must negotiate a special offer with BlueFractals, the developer of Overlay Gallery.
Click below to send a private message and begin the process. You may need to sign in to community.concretecms.com before you can message this user.Send Message
Overlay Gallery is perfect for building portfolios, image galleries, before and after images, timeline event slideshows, etc.
This add-on creates a responsive image gallery with mouseover target areas. It comes with transition effects and auto-slideshow features.