Web Wireframe Kit is a PSD file with a collection of common design elements for wire-framing. It comes in two colors: Black and White, a handy and time-saving tool for web designers.

Web Wireframe Kit is a PSD file with a collection of common design elements for wire-framing. It comes in two colors: Black and White, a handy and time-saving tool for web designers.

ProtoFluid is a free web based tool that instantly lets you test web applications or websites on various screen sizes, orientations and browsers, particularly mobile devices. ProtoFluid is particularly suited to the early development of fluid layout based web applications.

Input the URL, select the screen size and the device (iPhone, Droid, Nexus One or iPad) and preview your website.
Features
Codrops is sharing a stunning Full Page Image Gallery with scrollable thumbnails and a scrollable full screen preview.
It has a thumbnails bar at the bottom of the page that scrolls automatically when user moves the mouse. When a thumbnail is clicked, it moves to the center of the page and the full screen image is loaded in the background.

The demo is best viewed in Webkit browsers like Google Chrome or Apple Safari because this full page image gallery is using CSS3 Webkit properties to enhance the look and jQuery for the functionality.
The image gallery comes with a handy tutorial that is very easy to understand and follow.
SoundManager 2 is a free JavaScript Audio API supporting MP3, MPEG4 and HTML5 audio + RTMP (experimental), providing reliable cross-browser / platform audio control.

This free Javascript audio API makes it easier to play audio using Javascript, checkout few of its features below:
Everyone writes CSS differently. Less Framework takes this into account by having a minimal set of features, and does away with things like predefined classes. All it really contains are:

This CSS Framework uses inline CSS3 media-queries to switch between multiple layouts.
IE8 and below simply ignore everything inside inline media-queries. However, if you’d like IE to behave nicely, you can use something like css3-mediaqueries-js.