Digital Psychology - Elevate your product using psychological techniques
UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Usability.gov - Resource for user experience (UX) best practices & guides
draw.io - Online diagramming application
Nugget - Find your perfect startup idea
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.