Reflect - Reflect is a note-taking tool designed to mirror the way your brain works.
Iconoir - A diverse and open-source library with 900+ icons
Flat Icons - 20,000 unique, customizable icons with free lifetime updates
Vizzu - Vizzu lets you use animated charts to share insights in complex data sets as self-explanatory stories.
LineIcons - 2000+ line icons for designers and developers
IconStore - Free icon packs by first-class designers