Eclipse Theia. Eclipse Theia is an Eclipse open source project providing the Theia Platform and the Theia IDE.

The Eclipse Theia Platform is a free and open-source framework for building IDEs and tools based on web technologies. Theia-based applications can be deployed as desktop and web applications. It is implemented in TypeScript and emphasizes extensibility. With Theia AI, the platform provides explicit support for building tools and IDEs with artificial intelligence (AI) capabilities.

The Eclipse Theia IDE is an IDE for desktop devices and the cloud based on the Theia platform. It features a highly customizable developer experience and uses Theia AI to support AI features.

While Eclipse Theia incorporates certain components from Visual Studio Code, such as the Monaco editor, it is independently developed with a modular architecture and is not a fork of VS Code.

History 
Theia was originally developed by TypeFox and Ericsson, and continually receives contributions from EclipseSource, Red Hat, IBM, Google, Arm Holdings as well as from individual contributors. It was first launched in March 2017. Since May 2018, Theia has been a project of the Eclipse Foundation.
Eclipse Theia is now considered to be the next generation Eclipse Platform for tools and IDEs.

About 
Theia is built on the Language Server Protocol (LSP) and supports a variety of programming languages. It can be used as a desktop application, a web application, or a hybrid application with separate front and back ends. All of Theia's features are implemented as extensions, which allows third-party developers to modify Theia's functionality by using the same application programming interfaces (APIs) as the application's default components. Theia's layout consists of draggable docks. Theia is compatible with Visual Studio Code extensions.

Theia is a free and open-source software project under the Eclipse Foundation and is licensed under the Eclipse Public License 2.0 (EPL2).

Usage

 Arduino IDE 2.0 is based on Eclipse Theia, replacing the Processing-based IDE.
 Code Composer Studio by Texas Instruments uses Eclipse Theia as the framework for its development environment for Texas Instruments processors and microcontrollers.
 Mbed Studio by Arm is an IDE for embedded development, focusing on Arm microcontrollers, and is built on Eclipse Theia.
 The Theia IDE itself demonstrates the capabilities of Eclipse Theia as a general-purpose IDE, running on both desktop and cloud environments.
 Sokatoa is a tool for GPU profiling, analysis, and debugging workflows for Android, built on Eclipse Theia.
 The CDT Cloud Blueprint provides a reference architecture for cloud-based C/C++ development environments using Eclipse Theia.
 logi.cloud by logi.cals is a modern engineering platform for industrial automation, developed using Eclipse Theia.
 The Coffee Editor is a web-based modeling tool that showcases Eclipse Theia's integration with frameworks such as Eclipse GLSP and Sprotty.
 VUEngine Studio is a development environment for creating games and applications using the VUEngine framework, built on Eclipse Theia.
 Smartface is an IDE for developing cross-platform mobile applications, leveraging the Eclipse Theia framework.
 Record Evolution Studio (ReSWARM) is a collaborative platform for IoT and AI model training and deployment, based on Eclipse Theia.
 Code RealTime is a tool for developing real-time applications with debugging and collaboration features.
 QuickConnect Studio by Renesas is a development environment for prototyping and deploying embedded systems, built on Eclipse Theia.

Reception 
In January 2019, JAXenter, a website and blog about coding, ranked Theia as the third-most popular JavaScript integrated development environment of 2018 according to GitHub metrics, behind Visual Studio Code and Atom.

References 

2017 software
Free and open-source software
Integrated development environments
Software using the Eclipse Public License
Software using the GNU General Public License