LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
ProKeys - Save time and effort in emails, etc. with ProKeys!
Superdense - No text, just icons.