looking for a UTF-8 text editor

Question

I am looking for a (simple) text editor that can handle text in different encodings in the same document.

I need to develop some sites with mixed Japanese and Englis

Answer 1

EmEditor is written by a Japanese company for exactly this purpose. It is a fine text editor with good performance/simplicity but pretty much all the features expected of a capable editor; I use it as my default when on the Windows platform, as well as for editing Japanese web page templates. It deserves to be better-known IMO; it is at least as good as, say, TextPad, but with full Unicode support.

Unfortunately it is not free, however you can find a free version of the old EmEditor 6 at sites such as download.com.