Patternry

patternry

http://patternry.com/

Collaborative design patterns.

Process On

Process On

http://www.processon.com/

Web-based diagram tool.

Webflow

webflow

http://www.webflow.com/

Browser-based, drag-and-drop, responsive website tool.

FROONT

Froont

http://froont.com/

Browser-based, responsive website prototyping.

UX Pin

UXPin

http://uxpin.com/

UX Design & Wireframing Tool.

Appcooker

appcooker

http://www.appcooker.com/overview/mockup-wireframe-prototype-iphone-or-ipad-apps

iPad app for wireframing and prototyping iPad and iPhone apps.

Wireframe.cc

WIreframe.cc

http://wireframe.cc/

Simple, browser-based wireframing app.

Keynote

Keynote

http://www.apple.com/uk/apps/iwork/keynote/index.html

Flexible presentation app with prototyping and wireframing uses.

HotGloo

HotGloo

http://www.hotgloo.com/

Browser-based prototyping and wireframing app.

Balsamiq

Balsamiq

http://www.balsamiq.com/

Sketching tool for rapid wireframing.