material-e621

Material e621 is a modern, open source web client for e621.net. It is customizable, comes with a bunch of additional features that are not available on e621.net, and makes browsing posts a delightful experience. Maintained by avoonix on GitHub, where it has earned 85 stars from the community.

It's actively developed around material-design, yiff, nsfw, and is a solid reference for anyone building with these tools.