Notepad++ (popular with some on Windows) does optional Byte Order Marks on text files (subtitles, bash scripts, anything UTF-8 etc).

Not my editor of choice but some swear by it and are prone to work cross platform across NAS's and SSH terminals with either windows or some *nix as 'primary' work space.

I'm sure other editors have this as an option, the time I ran into BOM issues I traced it back to the use of Notepad++ by a third party.