n_coats

What services are freelance developers using to manage time logging, expense tracking, invoice generation, and reporting for multiple clients?

Preferably a service that offers both a web and native app.

Every now and then, I'll come across a site/app with a UI that completely pulls me in. It seems flawless. Most of them have a healthy blend of imagery complimented perfectly with other front-end components.

Are there any UI's that you find incredible, either from an artistic or technological perspective, and what is it about them that captures your attention?