below is top 10 free tools to help designers and frontend developers to get the job done quick

1: Bootstrap

twitter bootstrap is awesome css framework with a lot of features it designed to be mobile first framework with powerful and flexible grid system , i highly recomment it

2: Mockflow

mockflow is a cool wireframing tool you can sketch your design first to make sure it good and ui - ux perfect then you jumb to your photoshop :) the website has a free plan and also paid planes

Hey all
another freebie for you guys its from smashing magazine this time its a 33 ecommerce icons in a png and photoshop psd included also the Illustrator ai file with different sizes 32 × 32, 64 × 64, 128 × 128 and 256 × 256 pixels

it suit your mobile application too :)
download it its a free

Flat UI Free – PSD&HTML User Interface Kit

Hey Guys i know that i am not here all the time , but i will try to post at least a post a day so keep tuning
today i give you a freebie , an awesome Flat UI Kit you can use it on your next web project , it includes a free PSD and free icons its from the awesome Designmodo guys

Demo - Download

Flat UI package includes :-

 - PSD files

 - Layered (Shapes)

 - Retina Ready

 - Color swatches

 - Glyphs – svg format

 - Free font used – Lato

and
Flat UI html based on Twitter Bootstrap

HTML version of Flat UI includes :-

 - Twitter Bootstrap Framework based

 - Retina Ready Images and Icons

 - Custom form components

 - Sleek CSS3 effects

 -  OOCSS approach

 - Easy configurable color scheme

 - New web-font and new web-font icons

happy design , enjoy :)