Absolutely delightful collection of well-thought-out UI with distinct personality. Disappointing, though, that they ignore everyone but Apple and Google.
There are not too many good resources on getting thoughtful insight in UI/UX decision making. This is a great resource and terrific in it's use of crowd-sourcing the thoughts.
This blog has a bunch of screenshots with brief explanations of little UI/UX details that make a piece of software awesome to use. It’s fun to browse through and discover various tricks & techniques.