UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Color Palette Generator - Enter the URL of an image and find its color palette
draw.io - Online diagramming application
Color Hunt - Curated collection of beautiful colors, updated daily
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!