Apps similar to NINJA-IDE include Notepad++, which is free and open source. Other options are Sublime Text, Kate, Geany and PyCharm. Text Editors like NINJA-IDE are a crowded field, with more than 50 alternatives for Windows, Linux, Mac, Chrome OS and the web.
Editor.do is an all-in-one online IDE and hosting solution for creating, coding, and deploying static websites quickly. With over 1000 templates and libraries, it's ideal for developers of all levels.
Howl is a general purpose editor that aims to be both lightweight and fully customizable. It is built on top of the very fast LuaJIT runtime, and can be extended in either Lua or Moonscript. It has a minimalistic UI driven mainly by the keyboard.
Code Writer is a free text and code editor app for the Windows platform, downloadable from the Windows Store. Use it as a replacement for Notepad and other quick edit apps.
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Judge0 IDE is a free and open-source online code editor that allows you to write and execute code from a rich set of languages. It's perfect for anybody who just wants to quickly write and run some code without opening a full-featured IDE on their computer.
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HAPedit is an acronym for Html Asp Php editor; a win32 text-mode editor useful for all developers of dynamic web pages.
Caret is a lightweight-but-powerful programmer's editor running as a Chrome Packaged App. Inspired by Sublime and built on top of the Ace editing component, it offers:
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Jollpi is a lightweight, simple, and reliable text editor, built with Python 3, GTK4, and GtkSourceView 5. This version is a modern rewrite of the original 2010 Python 2 + PyGTK Jollpi text editor - now refreshed for modern Linux distributions.
FavoText is a text editor, which supports editing file with text/hex format, syntax highlighting and auto completion; it also offers many powerful features for Web page authors and programmers.
Text.app is a simple text editor for Chrome OS and Chrome. It's fast, lets you open multiple files at once, has syntax highlighting, and saves to Google Drive on Chrome OS.
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Notepas is a fast portable native multiplatform text editor written in Lazarus and can be compiled for multiple platforms and widget sets using the advanced native Free Pascal Compiler.
Notepad-like VB.Net multi-tab source code editor for Windows XP, Vista and Windows 7 that supports ASM, ASP.Net, Boo, C#, C++, CSS, HTML, INI, Java, JavaScript, Lua, Perl, PHP, Python, Ruby, SQL, VB.Net, XML and plain text files.
