Mooedit

 Open source cross-platform text editor with plugin support

 Author:   emuntyan
 Homepage: http://mooedit.sourceforge.net/
 Family:   MicrosoftWindowsEditors
 Platform: Windows
 License:  GPL

medit is a programming and around-programming text editor.

Started originally as a simple built-in editor component in GGAP, it grew up to a real text editor.

Configurable syntax highlighting.
Configurable keyboard accelerators.
Multiplatform - works on unix and windows.
Plugins: can be written in C, Python, or Lua.
Configurable tools available from the main and context menus. They can be written in Python or Lua, or it can be a shell script.
Regular expression search/replace, grep frontend, builtin file selector, etc.

 Screenshot: