ZionEdit is a very intuitive, highly configurable, light and uncluttered programmer’s editor based on the awesome Scintilla edit component.
ZionEdit can run multiple independent edit windows that can be placed and sized however you want. This makes side by side comparisons easy. Locations and sizes can be specified by start up switches. WxWidgets Inter Process Communication is used to ensure data, like history and style changes, is coordinated among windows. IPC also ensures that you don’t accidentally open a file as writable twice.
Download: ZionEdit 2.2.4