Top Alternatives to NINJA-IDE

Notepad++ is a free open source notepad replacement and code editor with nice features. It supports syntax highlighting for many languages and has an extension system as well.

Sublime Text is a code editor and syntax highlighter with advanced features which can be enhanced with extensions too.

gedit is a free and open-source code editor.

Geany is a text editor using the GTK+ toolkit with basic features of an integrated development environment.

Komodo Edit is a free text editor for dynamic programming languages.

PSPad is a freeware programmer's editor for Microsoft Windows operating systems.

KDE Advanced Text Editor (KATE) is a free and opensource text editor.

SciTE is a SCIntilla based Text Editor.

Bluefish is a free software advanced text editor with a variety of tools for programming in general and the development of dynamic websites.

jEdit is a free software text editor available under the GNU General Public License version 2.0. It is written in Java and runs on any operating system with Java support, including BSD, Linux, macOS and Windows.

PyCharm is cross-platform, with Windows, macOS and Linux versions.

Komodo IDE is an integrated development environment (IDE) for dynamic programming languages.

IDLE (Integrated DeveLopment Environment) or Integrated Development and Learning Environment) is an integrated development environment for Python.

Caret is a professional text editing for Chrome and Chrome OS.

PyScripter is a free and open-source software Python integrated development environment (IDE) for Windows. It is built in Object Pascal.

Editra is a cross-platform, open-source text editor, released under a wxWindows license.

Zed is a fully offline-capable, open source, keyboard-focused, text and code editor for power users.

Eric is a full featured Python editor and IDE, written in Python.

Pyzo is a free and open-source computing environment based on Python.