Pocket - When you find something you want to view later, put it in Pocket.
UI Movement - The best UI design inspiration, daily
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Design Hunt - Curated design inspiration for everyone
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
UI Jar - Hand-picked design inspiration for your real life projects