Online tools for prototype development, model building, and design feedback

Lumzy
Before you create a new UI technology, you need to create a prototype or model based on the concept before creating a website. Of course, you also need to test these new ideas.
Lumzy is a convenient online tool for building UI Models and prototyping. It allows you to create prototypes with work functions, not just wireframes:

Mockingbird
Another interface model building and prototype development tool, along with online group development tools:

UI design framework for Illustrator
Set a website with UI elements and styles for AI:

Unique Mobile UI design elements
Set the uidesign element freely:

Android UI elements set
Freely set the UI elements of Android OS:

OSX leopard GUI set
Gui elements of OSX Leopard:

All in one web elements Kit
Provide all PSD hierarchical files required for your website:

IPad GUI set
Provide any iPad app you needProgramThe topic's layered vector PSD file:

The penpencil Project
Firefox's Gui prototype build plug-in:

Concept feedback
Publish your design and concepts and get free feedback on the DesignCommunity:

Landing page optimization
Websites that receive real impression feedback from others about your target page within 5 seconds:

 

Author: Meng Chen
Source: http://www.cnblogs.com/xiaoyao2011/
You are welcome to reprint it in any form, but be sure to indicate the source.