Well, any text editor will work...
Bluefish, Quanta are two of the main and most used one's. But if your looking for something like Frontpage, not to bash it but it does suck IMO, it doesn't comply to standards, puts tags in that aren't needed and so on... But there isn't anything like Frontpage in Linux... though it is possible to get wine installed and use it to get Dreamweaver working in Linux which is a way better WYSIWYG editor.
Might want to search around the forums, this is asked all the time and could be other suggestions out there waiting.