1. Online tool for creating mockups in the browser.

  2. Team-based interface design, Figma lets you collaborate on designs in real time.

  3. The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.

  4. LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.

  5. Single-user mockup / wireframing / diagramming tool

  6. Wireframing and prototyping with webbased HotGloo. Create interactive, responsive wireframes for web and mobile. Includes 15-day free trial!

  7. Design is really about solving problems. UXPin is the UX Design Platform that gets that right.

  8. Diagramo is an online flowchart software - diagrams (create, edit and share)

  9. Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Sign up for a free 15-day trial and get started.

  10. Mockup Designer, built with Backbone, Backbone-LocalStorage and Html2Canvas, is a super-easy-to-use...

  11. Using Balsamiq Mockups feels like you are drawing, but its digital, so you can tweak and rearrange...

  12. Concept.ly - Free web & mobile(iOS,Android) prototyping and ui mockup tool