Hypershoot - Bookmarking tool made for designers
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Basket - A note taking application for KDE. Lots of features.
Pocket - When you find something you want to view later, put it in Pocket.
Linkpack - Save, read and share your links
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.