What resources do you absolutely need to have as a designer - online or offline (and preferably free).
BTW, here’s a free To-Do app interface from Invision
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What is a UI/UX designer?
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http://awwwards.com for UI design inspiration
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I believe you mean who* 
Like you may already know UX stands for User Experience and UI stands for User Interface.
So it’s basically the person in charge of how the user interacts with the product.
Mostly helps if the person has some psychology background or knowledge.
My links are
Crayon
Littlebigdetails
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I’m a regular on UX Magazine. You should also check out UX Archive , and Pattern Tap
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