Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Pocket - When you find something you want to view later, put it in Pocket.
Pinterest - Pinterest is a visual discovery tool that you can use to find ideas for all your projects and interests.