Galleries can be arranged as a grid, or as a masonry layout. Furthermore, you can set them up so that the open in a lightbox by clicking on each image.
You can control the number of columns, the spacing between each image, and even image shape.
Furnace is a free WordPress theme specially made to work with Forge, the free front-end page builder plugin for WordPress.
This theme has been designed to be as flexible as possible, helping you create awesome sites using only drag & drop.