Eclipse started as a Java IDE, but has since grown to be much, much more. Eclipse projects now cover static and dynamic languages; thick-client, thin-client, and server-side frameworks; modeling and business reporting; embedded and mobile; and, yes, we still have the best Java IDE.

Eclipse is the most popular and widely used IDE. It supports Java, PHP, C / C++, Mobile, Rich client applications, Modeling tools.

Eclipse

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++

Visual Studio Code is a new type of tool that combines the simplicity of a code editor with what developers need for their core edit-build-debug cycle. Code provides comprehensive editing and debugging support, an extensibility model, and lightweight integration with existing tools.
 
 VS Code has many of the features developers need in a code and text editor, including navigation, keyboard support with customizable bindings, syntax highlighting, bracket matching, auto indentation, and snippets, with support for dozens of languages.
 
It supports following languages HTML, Objective-C, Coffee Script, Lua, Perl, Visual Basic, TypeScript, HandleBars, Ruby, XML, SQL, PHP, JSON, Groovy, PowerShell, Java, Razor, Batch, Less, C#, Sass, Dockerfile, Clojure, Jade, CSS, Python, F#, R, Ini, C++, Rust, JavaScript, Swift, Makefile, Go, Markdown

Visual Studio Code is a new type of tool that combines the simplicity of a code editor with what developers need for their core edit-build-debug cycle. Code provides comprehensive editing and debugging support, an extensibility model, and lightweight integration with existing tools. 

Visual Studio Code - Code editing. Redefined

Brackets is a modern text editor that makes it easy to design in the browser. It's crafted from the ground up for web designers and front-end developers. It supports Inline editing, Preprocessor like LESS and SCSS support, Live preview support, make changes to CSS and HTML and you can instantly see those changes on screen.

Brackets - An open source code editor for the web, written in JavaScript, HTML and CSS

Eclipse Che is a developer workspace server and cloud IDE. Che defines workspaces that include their dependencies including embedded containerized runtimes, Web IDE, and project code. This makes workspaces distributed, collaborative, and portable to run anywhere on a desktop or a server. All Che services are reachable through RESTful APIs. 

Eclipse Che - Next-Generation IDE

Kdevelop is a free, open source IDE (Integrated Development Environment) for MS Windows, Mac OS X, Linux, Solaris and FreeBSD. It is a feature-full, plugin extensible IDE for C/C++ and other programming languages. It is based on KDevPlatform, and the KDE and Qt libraries and is under development since 1998. It supports  15 languages including Ada, C, C++, Objective-C (via C support), SQL, Fortran, Haskell, Java, PHP, Pascal, Perl, Python, Ruby, Bash, XUL (unofficially). Its feature include Itegrated Debugger, Code Editing, Supported VCS systems: CVS, Perforce, Subversion and Clearcase, Documentation viewer, Code Snippets, Doxygen integration, RAD tools, Valgrind integration etc.

Kdevelop is a free, open source IDE (Integrated Development Environment) for MS Windows, Mac OS X, Linux, Solaris and FreeBSD. It is a feature-full, plugin extensible IDE for C/C++ and other programming languages. It is based on KDevPlatform, and the KDE and Qt libraries and is under development since 1998.

Kdevelop

Padre is a Perl IDE, an Integrated Development environment, or in other words a text editor that is simple to use for new Perl programmers but also supports large multi-lingual and multi-technology projects. Its features include:
 <UL>
	<LI>Syntax highlighting</LI>
	<LI>Multi-document editing</LI>
	<LI>Remote editing via FTP (#12), HTTP, and SSH </LI>
	<LI>Syntax checking for Perl 5 and Perl 6</LI>
	<LI>Debugger supports Stepping, Breakpoints, Watches, Variable evaluation, Stack module </LI>
	<LI>Refactoring</LI>
	<LI>Support for creating and running unit tests</LI>
	<LI>Context sensitive help</LI>
	<LI>Regex Editor for building and debugging regular expressions </LI>
	<LI>Integrated version control</LI>
	<LI>Incremental search</LI>
	<LI>Code browser </LI>
	<LI>Integrated web server for CGI testing</LI>
 </UL>

Padre is a Perl IDE, an Integrated Development environment, or in other words a text editor that is simple to use for new Perl programmers but also supports large multi-lingual and multi-technology projects.

Padre

EPIC is Perl IDE (including editor and debugger) based on the Eclipse platform, compatible with Windows, Linux and Mac OS X. Whether you are into CGI scripting or full-fledged Perl projects with hundreds of modules, EPIC is the most feature-rich and extensible free Perl IDE available today. Its features include:
 <UL>
	<LI>Syntax highlighting </LI>
	<LI>On-the-fly syntax check </LI>
	<LI>Content assist </LI>
	<LI>Quick reference feature </LI>
	<LI>Outline view</LI>
	<LI>Source formatter</LI>
	<LI>Perldoc support</LI>
	<LI>Templating support</LI>
	<LI>Persistent breakpoints </LI>
	<LI>Single Step/Step Into/Step Over</LI>
	<LI>Global and local variables inspection</LI>
	<LI>Expression evaluation</LI>
	<LI>RegExp Plug-in</LI>
 </UL>

EPIC is Perl IDE (including editor and debugger) based on the Eclipse platform, compatible with Windows, Linux and Mac OS X. Whether you are into CGI scripting or full-fledged Perl projects with hundreds of modules, EPIC is the most feature-rich and extensible free Perl IDE available today.

EPIC

Spyder is a Python development environment with advanced editing, interactive testing, debugging and introspection features. It is especially recommended for scientific computing thanks to NumPy (linear algebra), SciPy (signal and image processing), matplotlib (interactive 2D/3D plotting) and MayaVi’s mlab (interactive 3D visualization) support. Spyder may also be used as an extension library providing powerful console-related PyQt4 widgets. Spyder is part of spyderlib, a Python module based on PyQt4 and QScintilla2.

Spyder is a Python development environment with advanced editing, interactive testing, debugging and introspection features. It is especially recommended for scientific computing thanks to NumPy (linear algebra), SciPy (signal and image processing), matplotlib (interactive 2D/3D plotting) and MayaVi’s mlab (interactive 3D visualization) support.

Spyder

Aptana Studio harnesses the flexibility of Eclipse and focuses it into a powerful web development engine. It helps to build web applications quickly and easily. It could be downloaded as Eclipse plugin or standalone. It supports popular JavaScript libraries and frameworks such as jQuery, prototype, scriptaculous, Ext JS and more. It supports Java, Python, PHP, Ruby based development. It has all features required for an IDE like file / project browser, Debugger, Code assit, Code Search and lot more. <img src="/AppImages/Article/aptana-img1.jpg" alt="" class="float-center">

Aptana Studio harnesses the flexibility of Eclipse and focuses it into a powerful web development engine. It helps to build web applications quickly and easily. It could be downloaded as Eclipse plugin or standalone.

Aptana - Web development IDE

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments. 
 
Arduino can sense the environment by receiving input from a variety of sensors and can affect its surroundings by controlling lights, motors, and other actuators. The boards can be built by hand or purchased preassembled; the software can be downloaded for free. The hardware reference designs (CAD files) are also available under an open-source license,

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments. 

Arduino - Electronics Prototyping Platform

LiteIDE is a simple, open source, cross-platform Go IDE.
<ul>
<li>Core features
<ul>
<li>System environment management</li>
<li>Configurable build commands</li>
<li>Simple and open debug system</li>
<li>Kate format for auto-completion and theming</li>
<li>Configurable auto-completion with WordApi</li>
<li>MIME type based system</li>
<li>Plugin support</li>
<li>Quick Open</li>
</ul>
</li>
<li>Golang support
<ul>
<li>Package browser</li>
<li>Class view and outline</li>
<li>Document browser</li>
<li><a href="https://github.com/nsf/gocode">Gocode</a> support</li>
<li>GOPATH API index</li>
<li>Code Navigation</li>
<li>Find Usages</li>
<li>Code Refactor</li>
<li>Go playground</li>
</ul>
</li>
<li>Additional support
<ul>
<li>Markdown</li>
<li>Json</li>
<li>Golang Present</li>
</ul>
</li>
</ul>

LiteIDE is a simple, open source, cross-platform Go IDE.

LiteIDE - Simple, open source, cross-platform Go IDE. 

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