Raindrop.io - All your articles, photos, video & content from web & apps in one place.
LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.
LinkAce - A selfhosted bookmark manager with advanced features.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Pinterest - Pinterest is a visual discovery tool that you can use to find ideas for all your projects and interests.
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.