UI and UX and Design

A good interface is like a joke, you don't need to explain it.

If something is unclear - clarify it

If something is arduous - lighten the load

If something is complex - make it simpler

If something is over verbose - strip it back

If something is ambiguous - clarify it

If something is big - make it feel manageable

If people get lost let them find their way out

If something goes wrong - let people recover

If something seems pointless - show the value

If something is dry add some levity

If something is dreary add some delight

If something needs explaining - explain it carefully

Make the important stuff important and the other stuff less so

Less is more (but you probably knew that)

Make desired actions obvious - show the way

If something feels daunting - provide support

If something goes right - say it did

If something goes bad - say it did

If something requires effort - set expectations

If something feels risky provide reassurance

If something feels fragile make it feel solid

If somethings looks great it’ll help to make it feel great

Bring structure to the unstructured

Don’t presume anything

Don’t try to be clever

Source: http://mistermorris.tumblr.com/post/26063374202/ux-is-simple

Guidelines

Official Usability, User Experience And User Interface Guidelines From Companies

Dark Patterns - User Interfaces Designed to Trick People

Dark Patterns: The Sinister Side of UX 

The art of negative space: 30 examples

Complete Beginner’s Guide to Interaction Design

Design Tools

UI Tiles

100+ Awesome UX Tools For UX Designers

Moqups

X to Close - the origin of the use of [x] in design

Simple Ideas to Make things Better

UX is UI

The Difference Between Information Architecture and UX Design

Not click. Not tap. Select. : Cennydd Bowles

Don’t cut corners when coding UI

7 Simple Rules for Creating Elegant UI Interactions

Unflattening design

5 Simple UX Principles to Guide your Product Design

What Separates Great Design From Good Design

A Front End Engineer's Manifesto

5 Things that Make Website Visitors feel Stupid (so avoid them)

Dropdowns should be used as a last resort

Apple's UI Design Do's and Don'ts

Detox Your Design: 8 UI Elements to Eliminate

How to use balance in web design

The 8 Worst UX Mistakes Coming From Experts

Delightful Design, Deconstructed

Design With Dissonance

Asymmetrical Design: Creating Beautiful, Balanced Layouts

UI Design for Passwords and Registration Forms

Revisiting :Visited

UICloud | User Interface Design Search Engine, UI Elements, GUI Design, Free Downloads

“Right-click and save as” needs to go away

Not click. Not tap. Not select. Press

Text on background image a11y check

A Psychological Approach to Designing Interfaces

Ignorance Beats Empathy

3 ways friction can improve your UX « Thoughts on users, experience, and design from the folks at InVision

Let the Browser Handle Your UI Logic for You

10 Photoshop Plugins to Speed up Your Web Design process

Why “Simple” Websites Are Scientifically Better

Little Big Details (not updated recently but full of good ideas)

Sometimes you just have to see it

Levelling Up: From UI to Product Design

Older but still informative - 10 Useful Techniques To Improve Your User Interface Designs, and Whitespace.

Design System Encyclopedia