An evolution of The Turning Gate's traditional thumbnail gallery, CE3 Standard organized thumbnails into a responsive grid and supports all of the accessory options such as Google Maps integration, hi-res image download, exif and metadata display, color labels, e-commerce features and more.
The maximum number of columns is a function of cell width vs. container width. On smaller displays, images will reflow into fewer columns as necessary. In the image below, thumbnail cells are 210-pixels wide with 4-pixel margins on either side, so the total occupied width of each cell is 218-pixels. In my 1140-pixel container, I can nicely accommodate 5 columns (218 * 5 = 1090) with a bit of room to spare:
Narrow the available space, and the gallery reflows to four columns: