GridGallery lets you quickly arrange, filter, and stylize photos into seamless visual grids.

Apply filters (by brightness or filename) and visual effects like blur or vignettes.

Arrange image collections into structured, custom layouts.
GridGallery for macOS,
https://www.isleofthekakapo.com/gridgallery.html

Create seamless patterns for wallpapers or digital presentations.

GridGallery is a macOS app that arranges image files into customizable grid layouts. It features controls for rows, columns, and spacing, alongside filters to select images by brightness or filename. The app also includes tools for applying visual effects and generating seamless tiling patterns.