eclipse-theia/theia

Eclipse Theia is a framework, a toolkit for developers, that lets you build your own code editor or development environment, either running in a web browser or as a desktop application. Think of it as the construction kit underneath an IDE (integrated development environment, a program like the editor people use to write code), rather than a finished product you use directly. The problem it solves is that building a full-featured code editor from scratch is enormously complex. Theia provides the foundation: file browsing, code editing with syntax highlighting, support for extensions, and the ability to connect to language servers (background services that power features like auto-complete and error checking). Builders can then layer their own features on top to create a specialized tool for a particular workflow or industry. A key selling point is that Theia supports the VS Code extension protocol, meaning many extensions written for the popular VS Code editor can also run in a Theia-based IDE without modification. Theia can be packaged as a browser app or bundled into a desktop app using Electron (a technology that wraps web apps into installable desktop programs). You would use Theia if you are a company or developer who wants to ship a branded code editor, for example, a cloud-based IDE tied to your own platform or product, without starting from zero. The project is governed by the Eclipse Foundation and licensed under open-source terms, written in TypeScript.