Question : any one plese try  nocat        or chii hot spot

Which one you like and can you suggest opensource like that

Answer : any one plese try  nocat        or chii hot spot

http://nocat.net/

...suggests that you can download open-source versions of nocat.

If you don't like nocat, I think ntop sounds similar (I must admit to have never used nocat, however).

What exactly are you asking?

Cheers,
-Jon