FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
draw.io - Online diagramming application
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.