A free, open-source Integrated Development Environment for software developers. You get all the tools you need to create professional desktop, enterprise, web, and mobile applications with the Java language, as well as C/C++, PHP, JavaScript, Groovy, and Ruby. It easy to install and use straight out of the box and runs on many operating systems including Windows, Linux, Mac OS X and Solaris. The NetBeans IDE 6.8 is the first integrated development environment to provide complete support of Java EE 6 and the GlassFish Enterprise Server v3 platform. Developers hosting their open-source projects on kenai.com benefit from improved instant messenging and issue tracking integration in the IDE, including full support for JIRA. Other improvements include new powerful C/C++ profiling features, support for web application development with PHP 5.3 and the Symfony framework, and improved code completion, hints and navigation in JavaFX projects.

An IDE to create professional desktop, enterprise, web, and mobile applications with the Java language, as well as C/C++, PHP, JavaScript, Groovy, and Ruby.

NetBeans

CodeLite is an open source, free, cross platform IDE for the C/C++ programming languages which runs on all major Platforms. It has generic support for compilers with built-in support for GCC/clang/VC++, GDB Support,  Refactoring, Code Navigation,  Source Control Plugins,  RAD Tool for wxWidgets,  Code Completion and lot more. 

CodeLite - Cross Platform IDE for C/C++

Oni is a new kind of editor, focused on maximizing productivity - combining modal editing with features you expect in modern editors. Oni is built with neovim, and inspired by VSCode, Atom, LightTable, and Emacs. The vision of Oni is to build an editor that allows you to go from thought to code as easily as possible - bringing together the raw editing power of Vim, the feature capabilities of Atom/VSCode, and a powerful and intuitive extensibility model - wrapped up in a beautiful package. This repository is under active development, and until 1.0 please consider everything unstable.
 
<ul>
<li>Modern UX - The Vim experience should not be compromised by terminal limitations.</li>
<li>Rich plugin development - using JavaScript, instead of VimL.</li>
<li>Cross-platform support - across Windows, OS X, and Linux.</li>
<li>Batteries included - rich features are available out of the box - minimal setup needed to be productive.</li>
<li>Performance - no compromises, Vim is fast, and Oni should be fast too.</li>
<li>Ease Learning Curve - without sacrificing the Vim experience.</li>
</ul>

Oni is a new kind of editor, focused on maximizing productivity - combining modal editing with features you expect in modern editors. Oni is built with neovim, and inspired by VSCode, Atom, LightTable, and Emacs. The vision of Oni is to build an editor that allows you to go from thought to code as easily as possible - bringing together the raw editing power of Vim, the feature capabilities of Atom/VSCode, and a powerful and intuitive extensibility model - wrapped up in a beautiful package. This repository is under active development, and until 1.0 please consider everything unstable.

Oni - new kind of editor, powered by Neovim

Codebox is a complete and modular Cloud IDE. It is an open source component of codebox.io (Cloud IDE as a Service).The IDE can run on your desktop (Linux or Mac), on your server or the cloud. Codebox is built with web technologies: node.js, javascript, html and less. The IDE possesses a very modular and extensible architecture, that allows you to build your own features with through add-ons. 

Codebox - Open source Cloud & Desktop IDE

Theia is an extensible platform to develop full-fledged multi-language Cloud & Desktop IDE-like products with state-of-the-art web technologies. Theia is entirely written in TypeScript and clearly separates the UI frontend from the backend. The frontend runs in modern browsers or as a Desktop app using Electron with either local or remote (cloud) backends. 
 
Theia provides the VS Code experience in the browser. It integrates a full featured terminal, that reconnects on browser reload keeping the full history. Theia is based on a state-of-the-art web-based technology stack. It provides language support via LSP and DAP.

Theia is an extensible platform to develop full-fledged multi-language Cloud & Desktop IDE-like products with state-of-the-art web technologies.  Theia is entirely written in TypeScript and clearly separates the UI frontend from the backend. The frontend runs in modern browsers or as a Desktop app using Electron with either local or remote (cloud) backends. 

Theia - Cloud & desktop IDE framework implemented in TypeScript

Gitpod is an open-source Kubernetes application for ready-to-code developer environments that spins up fresh, automated dev environments for each task, in the cloud, in seconds. It enables you to describe your dev environment as code and start instant, remote and cloud-based developer environments directly from your browser or your Desktop IDE.
 
Gitpod continuously builds your git branches like a CI server so that you can start coding right away - no more waiting for dependencies to download and builds to finish. Tightly integrated with GitLab, GitHub, and Bitbucket, Gitpod automatically and continuously prebuilds dev environments for all your branches. As a result, team members can instantly start coding with fresh, ephemeral and fully-compiled dev environments - no matter if you are building a new feature, want to fix a bug or do a code review.

Gitpod is an open-source Kubernetes application for ready-to-code developer environments that spins up fresh, automated dev environments for each task, in the cloud, in seconds. It enables you to describe your dev environment as code and start instant, remote and cloud-based developer environments directly from your browser or your Desktop IDE.



Gitpod - Automates the provisioning of ready-to-code development environments

VSCodium is a Free/Libre Open Source Software Binaries of VS Code. This is a repository of scripts to automatically build Microsoft's vscode repository into freely-licensed binaries without MS branding / telemetry / licensing with a community-driven default configuration.

VSCodium - VS Code without MS branding / telemetry / licensing

SpaceVim is a community-driven vim distribution that supports vim and Neovim. SpaceVim manages collections of plugins in layers. Layers make it easy for you, the user, to enable a new language or feature by grouping all the related plugins together. 

SpaceVim - A community-driven vim distribution inspired by spacemacs

Onivim 2 is a reimagination of the Oni editor. Onivim 2 aims to bring the speed of Sublime, the language integration of VSCode, and the modal editing experience of Vim together, in a single package. Onivim 2 is built in reason using the revery framework.
 
Onivim 2 uses libvim to manage buffers and provide authentic modal editing, and features a fast, native front-end. In addition, Onivim 2 leverages the VSCode Extension Host process in its entirety - meaning, eventually, complete support for VSCode extensions and configuration.

Onivim 2 is a reimagination of the Oni editor. Onivim 2 aims to bring the speed of Sublime, the language integration of VSCode, and the modal editing experience of Vim together, in a single package. Onivim 2 is built in reason using the revery framework.

Onivim 2 - Lightweight, Modal Code Editor

Geany is a small and lightweight Integrated Development Environment. It supports filetypes including C, Java, PHP, HTML, Python, Perl, Pascal. Its basic features include Syntax highlighting, Code folding, Symbol name, auto-completion, Construct completion/snippets, Code navigation etc. Geany is light weight and only requires the GTK2 runtime libraries. 

Geany - Text Editor using GTK2

Ninja-IDE is a cross-platform integrated development environment (IDE) that runs on Linux/X11, Mac OS X and Windows desktop operating systems. Ninja-IDE allows developers to create applications for any purpose making the task of writing software easier and more enjoyable.It is specially designed for Python Applications Development.

Ninja-ide - Not Just Another IDE for Python

The aim of Scala IDE is to provide a support for Scala development equivalent to the support provided by Eclipse for Java development. It has support for Mixed Scala/Java Projects, Code Completion, Semantic Highlight, Error Marker, Debugger, Syntax Coloring, Scala JUnit4 Runner and lot more.

Scala IDE for Scala and Java

BlueJ is a development environment that allows you to develop Java programs quickly and easily. BlueJ has several features not seen before in other IDEs. Its object bench, code pad, and scope colouring were all original BlueJ features. Objects can be inspected while the program is running. The contents of fields are displayed to aid understanding and debugging.

BlueJ - IDE for Java

Bluefish is a powerful editor targeted towards programmers and webdesigners, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages, and it focuses on editing dynamic and interactive websites. Its features include:
 <UL>
	<LI>Lightweight, Fast </LI>
	<LI>Multiple document interface, easily opens 500+ documents </LI>
	<LI>Multi-threaded support </LI>
	<LI>Very powerful search and replace</LI>
	<LI>Integrate external programs </LI>
	<LI>In-line spell checker </LI>
	<LI>Full screen editing </LI>
	<LI>Customizable programming language support</LI>
	<LI>Multiple encodings support</LI>
	<LI>HTML toolbar and tearable menu's</LI>
	<LI>Compliance with the Gnome and KDE </LI>
 </UL>

Bluefish is a powerful editor targeted towards programmers and webdesigners, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages, and it focuses on editing dynamic and interactive websites.

Bluefish

Codelobster PHP Edition streamlines and simplifies php development process. It provides HTML editor, HTML code inspector, CSS editor, JavaScript editor, PHP editor, PHP debugger and lot more. 

 Its features include 
 <UL>
	<LI>Code highlighting for PHP, HTML, JavaScript and CSS</LI>
	<LI>Powerful autocompletion for HTML, PHP, CSS and Javascript, including HTML5 and CSS3. For PHP the structure of project is fully recognized, and the complete list of methods falls out in the proper places.</LI>
	<LI>HTML/CSS inspector on the type of Firebug, which allows easily to correlate the selected elements of page with a code and proper style.</LI>
	<LI>Context help on all supported languages. By pressing F1 key the page with detailed description for current tag, attribute or function will be opened.</LI>
	<LI>PHP debugger allows to execute PHP scripts incrementally, watching the values of all variables in every line.</LI>
	<LI>SQL manager allows to produce all necessary actions with a database - to add, delete, edit a structure and records in tables, to export data, execute SQL queries. Highlighting and autocompletion works for SQL files also.</LI>
	<LI>Support of FTP allows to work straight with a remote server and to do all necessary changes with files.</LI>
	<LI>The portable option allows to use editor without the preliminary installation.</LI>
	<LI>Other useful utilities: pair highlighting, possibility of blocks selection, collapsing, tooltips, navigation on descriptions of functions and included files at withholding of the key of CTRL, viewing of structure of files and project, preview in a browser, book-marks, and all other standard possibilities for work with a code.</LI>
	<LI>Plugins available for Drupal, Joomla, CakePHP, CodeIgniter, Symfony, Yii, JQuery, WordPress, Smarty </LI>
 </UL>

 <img src="/AppImages/Article/codelobster-img1.png" alt="" class="float-center"> 

 It is NOT open source. It has Free, Lite and Professional editions available. Free editon has limited set of features but it is worth to take a look.

Codelobster PHP Edition streamlines and simplifies php development process. It provides HTML editor, HTML code inspector,  CSS editor, JavaScript editor, PHP editor, PHP debugger and lot more.

Codelobster - Free Portable IDE for PHP/HTML/CSS/JavaScript Development

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