Raindrop.io
Bookmark manager with collections, tags, and highlights for saved pages.
Raindrop.io saves links into nested collections with tags, previews, and inline highlights, and syncs them across browsers and devices. It is built by independent developer Rustem Mussabekov and has been in continuous development since 2013. The free plan allows unlimited bookmarks and collections, and a paid Pro tier adds full-text search, permanent page copies, and duplicate detection.