SciTE is described as 'SCIntilla based Text Editor. Originally built to demonstrate Scintilla, it has grown to be a generally useful editor with facilities for building and running programs' and is a well-known app in the Development category. There are more than 100 alternatives to SciTE for a variety of platforms, including Windows, Mac, Linux, BSD and Chrome OS. The best alternative is Visual Studio Code, which is free. Other great apps like SciTE are Notepad++ (Free, Open Source), Atom (Free, Open Source), Sublime Text (Free Personal) and Vim (Free, Open Source).
PyScripter is a free and open-source Python Integrated Development Environment (IDE) created with the ambition to become competitive in functionality with commercial Windows-based IDEs available for other languages.
Acme is a powerful text editor, development environment and textual-user-interface platform developed by Rob Pike originally for Plan 9 from Bell Labs research operating system, and now has ports available for all major platforms.
BabelPad is a free Unicode text editor for Windows that supports the proper rendering of most complex scripts, and allows you to assign different fonts to different scripts in order to facilitate multi-script text editing.
Tilde is a text editor for the console/terminal, which provides an intuitive interface for people accustomed to GUI environments such as Gnome, KDE and Windows. Example: copy current selection is Control-C; paste previously copied text is Control-V.
4coder is a minimalist, cross platform, programmable, code editing environment, catering to the needs of low level programmers. It allows you to use one work flow across Windows, Linux, and Mac (with the exception of your debugger... for now.).
vy is a modal editor with a very modular architecture. vy is built on top of Tkinter which is one of the most productive graphical toolkits; It permits vy to have such a great programming interface for plugins.