Gallery Extension
Having built a few sites using powergallery (1.xx) I like and am familiar with the interface, and find it easy to show clients how it works.
Nowadays I tend not to use the gallery for display purposes, but like to use the admin section to manage the images.
Rather than a full solution, a powergallery builder extension could be a useful tool, developing in a similar way that powercms builder came from the powercms solution