An open source typeface made of purposely redacted letters, which is presenting content as abstract bars.

BLOKK font gives you a nice fill text for mock-ups and wireframing without the lorem ipsum. The new and better wireframing font. BLOKK is a font for quick mock-ups and wireframing for clients who do not understand latin.

Moqups is a nifty HTML5 App used to create wireframes, mockups or UI concepts, prototypes depending on how you like to call them.

Design, collaborate user interface concepts for your software and websites.

Creating rich interactive wireframes to define web and mobile apps allows you reduce rework and avoid misunderstandings.

Visual authoring of HTML5 user interfaces - in the browser!