You can find almost anything you want online, most of the times for free. I have been collecting and organizing my ‘references’ for quite some time and today i will start sharing some of the best websites that I know to find great content to help you design your current and coming projects!
There are different category of useful things, so I will do my best to divide it in a way that makes sense! Here it goes:

What’s your favourite site to find handy resources?

Tutorials:

Best way to find good resources and learn at the same time. 2 Birds 1 stone!
Photoshop: psd.tutsplus.com | smashingmagazine.com/photoshop |
Vector: vector.tutsplus.com (Illustrator and inDesign)

Free Icons/ PS&AI Files/ Backgrounds/ Web and Print Elements

premiumpixels.com | designwoop.com | www.bittbox.com (Textures, Fonts, Brushes, Vector)
creativenerds.co.uk (Photoshop Brushes, patterns, Fonts & Icons) | webportio.com (Webdesign & Fireworks) | HUGE Library of WEB Elements – bypeople.com

High Definition Textures & Web Patterns:

cgtextures.com | texturelib.com | subtlepatterns.com

¡New! Ultimate Guide for Free Stock Photography:

Stock.XCHNG | creativecommons.org | Us government dotgovwatch.com | Small But unique gimp-savvy.com | public-domain-photos.com | openphoto.net | photos8.com – really good | publicdomainpictures.net 

Free Useful Designer Apps:

Lorem Ipsum Generator |

Photoshop Actions

BJANGO – iPad – iPhone

User Interface KITS

Design Woop List

InDesign Scripts & Plugins

SmashMag List

Free Fonts

Best Fonts 2013

Share your favourite sites to find resources in the comments!