[codegeek]

I second freshbooks. Free for upto 3 clients. Not sure why you think the UI is clunky. I like their simple and elegant UI/UX. Been using it for almost 3 years now. Gets the job done without too much baggage.

[JamesSwift]

I think you must be grandfathered into the 3 client free account, it is limited to 1 now.