There are 2 repositories under booru-image-viewer topic.
fully local image viewer alternative for stable diffusion
Image Viewer and Endless Scroll userscripts for Gelbooru and various other boorus
Booru sites masonry browsing mode. Booru 站点瀑布流浏览 Web 版
A Booru Desktop Client - to view, download & bookmark posts or images
Fully customizable Booru browser application. Now on your phone.
A Booru Desktop Client - to view, download & bookmark posts or images
booru web client
Homebooru is a home solution for storing a large amount of images, created with the "booru-like" style in mind.
A small booru image viewer. Supports any danbooru forked image board with json api.
A humble front-end replacement for https://e621.net, using their API. With mobile support, subscriptions, and more.
MoeTag is a C++/Qt light weight, multimedia/booru browsing application.
SearXNG is a free internet metasearch engine which aggregates results from various search services and databases. Users are neither tracked nor profiled.