"generally", LLC should be fine for a freelancer, and technically, you can do it without that. Goto your bank and tell them you want to setup a DBA (doing business as) - then it'll be Hauget doing business as Hauget Development Co. (for example)
Personally, (for freelance), I became an employee (W2, no more 1099)of a friend's slightly related business and all my freelance business goes through him. He takes a cut, paying business taxes, medicaid, etc... taxes come out of my freelance paycheck as any normal employee would, and I don't have to worry about the accounting stuff at the end of the year.
S-corps require an annual filing and a small annual fee: $65 here in NC.
That said, I'm not sure what your tax responsibilities would even be as a foreigner. @lsiunuex is correct, unless your income is above ~$50k, there's absolutely no advantage to undertaking this headache -- and certainly not merely for freelance income.