Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Weava - Workspace to highlight, organize & collaborate on your research articles.
Pocket - When you find something you want to view later, put it in Pocket.
Good Annotations - A online annotation tool that is perfect for providing feedback to your team.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Genius Annotations - Embed text annotations on your site. Annotate the web.