UnEditor

 UnEditor is a text editor for Microsoft Windows.

 Author:    Yokka
 Homepage:  http://www.yokkasoft.net/
 Family:    -
 Platform:  Windows
 License:   Freemium

It is a so-called Tab editor (TabUnTabEditor) that can be used to display multiple files like a tabbed browser and edit them.

Features:

Multi-editing functions using tabs
Word highlighting for files you want to edit.It supports various languages such as VB, Delphi, HTML and PHP
Powerful text comparison for multiple files (Diff）
Powerful text batch search for multiple files (Grep
Automatically recognizes each character code
Simple HTML editing functions
There is a function called a display theme, it has become possible to greatly change the appearance

 Screenshot: