I really enjoyed Gifable, a self-hosted gif library. It was great, albeit a bit feature light. About 3 years ago the maintainer stopped maintaining and went AFK, nothing to be heard of then. I’ve since forked it, and I’ve been working on some new features to hopefully bring it up to speed. (Things like S3 storage, using AI image captioning to auto-caption your memes, categories, and hopefully full matrix integration), but it’s a slog.