Pocket - When you find something you want to view later, put it in Pocket.
CallMeIcons - CallMeIcons is a tool to create icons of your favorite people and add them to your iPhone’s home screen.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Panelio - Panelio helps you to save and organize your links.
Padlet - Visual boards for organizing anything.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community