Raindrop.io - All your articles, photos, video & content from web & apps in one place.
LinkAce - A selfhosted bookmark manager with advanced features.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Bookmark Sidebar - Adds a toggleable sidebar with all your bookmarks at the edge of your browser window.
Linker - Cloud based bookmark manager
Trove App - Privacy-focused bookmark manager to save anything from web.