Quote Originally Posted by jermaine
true, but there are also some commercial ones.
Dreamweaver, as well as Adobe GoLive and Microsoft FrontPage are commercial because they support WYSIWYG web page development. That's hard to do on your own because you have to impliment your own rendering system for web pages. Also, none of those options I mentioned give 100% valid code, especially FrontPage.

So you can either make one like Notepad++ that I honestly don't see why anyone would purchase it since there are tons of free options, or a WYSIWYG editor which will take a long time to make and will be very difficult. Plus, you'd have to compete with Macromedia/Adobe and Microsoft (who actually discontinued FrontPage and is creating a whole new app that is supposed to be much better).

If you want to do this as a project/hobby, then go for it but if you're expecting to get any kind of return on this idea, then I'd say look for another project.