Diagrams for Mac - A diagram editor for visualizing structures and processes
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
The Data Visualisation Catalogue - Reference tool for data visualisation
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
nivo - nivo provides a rich set of dataviz components
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.