Pocket - When you find something you want to view later, put it in Pocket.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Basket - A note taking application for KDE. Lots of features.
Readit - The most feature-complete reddit client on Windows Phone and Windows 10.
Padlet - Visual boards for organizing anything.