OmniGraffle for Mac and iOS lets you create precise, beautiful graphics, from website wireframes, electrical systems, family trees and maps of software classes

A streamlined web app that helps you create and collaborate on wireframes, mockups, diagrams & prototypes for any type of project

MockFlow provides a full stack UX solution for design teams that includes wireframing, sitemaps, UI spec systems, design workflow and more

Lucidchart provides an intuitive and collaborative diagramming solution

JustInMind is a powerful wireframe software to define web and mobile applications.

Mockingbird is an online tool that makes it easy for you to create, link together, preview, and share mockups of your website or application.

Gliffy is an online diagramming and team collaboration SaaS makes it possible for anyone to diagram like a boss.

Flinto lets designers quickly make interactive prototypes of their mobile, desktop, or web apps.

Balsamiq is a wireframing tool to help rid the world of bad software. It reproduces the experience of sketching on a whiteboard, but using a computer.