Conceptboard

conceptboard

Browser-based visual collaboration.

http://conceptboard.com/

Process On

Process On

http://www.processon.com/

Web-based diagram tool.

Notism

notism

https://www.notism.io

Design collaboration tool with Basecamp integration.

Spacedeck

spacedeck

https://spacedeck.com/

Visual collaboration for teams.

Google Sketchup

GoogleSketchup

http://www.sketchup.com/

Simple 3D modelling software.

Amazon Storyteller

amazon storyteller

http://studios.amazon.com/storyteller

Web-based storyboarding platform. You should test internet speed before check this post.

Greenhouse

http://www.oblong.com/greenhouse

Prototyping tool for spatial interfaces.

Touchpoint Dashboard

http://www.touchpointdashboard.com

Web-based journey mapping tool.

LiveSurface

LiveSurface

http://www.livesurface.com/context.php

Context prototyping app for real world visualisations.

color.hailpixel

color.hailpixel

http://color.hailpixel.com/

Simple, browser-based colour palette tool.