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

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++

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

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

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

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

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

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