Plectica - Easily diagram anything, together
Google Design Sprint Kit - Your resource for planning and running a Design Sprint
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.
Overflow for Windows - The world’s first user flow diagramming tool for designers
StdLib - Discover pre-built APIs, compose your own and build apps