VisualSitemaps - Autogenerate visual sitemaps in seconds.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Codrops Blueprints - Free website concepts ready to implement or modify
Invision - Prototyping and collaboration for design teams
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.
Sketch - Professional digital design for Mac.