Curator - The visual notes app, now on iPhone!
Color - Generate, visualize, and document accessible color palettes
Ziteboard - Ziteboard is an zoomable online whiteboard that lets team to collaborate in real-time.
Color Hunt - Curated collection of beautiful colors, updated daily
Call to Idea - A gallery of inspiration for product designers
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!