Here’s a list of the best self-hosted, open-source web-based IDEs, ideal for those who want control over their development environment on their own servers:

1. Eclipse Theia

• Description: Eclipse Theia is an open-source web-based IDE that provides a powerful and extensible development environment. Built with modularity in mind, it offers a customizable experience similar to VS Code.
• Key Features: Multi-language support, VS Code extensions, Docker and Kubernetes support, and a flexible architecture.
• Ideal For: Developers seeking a VS Code-like experience with flexibility for custom extensions.
• Link: Eclipse Theia

2. Code-Server (VS Code in the Browser)

• Description: Code-Server allows you to run Visual Studio Code on a remote server and access it through your browser. It’s ideal for those who want the power of VS Code in a cloud-based or remote setup.
• Key Features: Full VS Code experience, extension support, and multi-language support.
• Ideal For: Developers who prefer VS Code and want a seamless browser experience.
• Link: Code-Server

3. Eclipse Che

• Description: Eclipse Che is a comprehensive web IDE designed for cloud-native development. It supports containerized workspaces and integrates with Kubernetes.
• Key Features: Kubernetes integration, containerized development environments, and collaborative coding features.
• Ideal For: Cloud-native development and teams using Kubernetes and Docker.
• Link: Eclipse Che

4. Gitpod Self-Hosted

• Description: Gitpod provides automated, pre-configured development environments with Git integration. The self-hosted version offers the same experience but can be deployed on your own infrastructure.
• Key Features: GitHub, GitLab, and Bitbucket integration, VS Code compatibility, automated setups, and Docker support.
• Ideal For: Git-based collaborative environments that need automated, containerized development setups.
• Link: Gitpod Self-Hosted

5. Coder (Coder OSS)

• Description: Coder OSS is a platform that allows you to set up secure, containerized development environments for remote development teams. It supports VS Code and Theia IDE.
• Key Features: Secure, containerized workspaces, multi-language support, and role-based access control.
• Ideal For: Enterprise teams requiring secure, scalable development environments.
• Link: Coder

6. Cloud9 Community Edition

• Description: Cloud9 was originally an open-source IDE before AWS acquired it. The Community Edition, which is still available, offers a range of development tools in a web-based interface.
• Key Features: Real-time collaboration, multiple language support, and a full-featured IDE.
• Ideal For: Developers who enjoyed the original Cloud9 experience and want to self-host it.
• Link: Cloud9 Community Edition

7. Koding

• Description: Koding is a web-based IDE with a collaborative development environment, supporting multiple languages and offering easy setup.
• Key Features: Collaboration tools, virtual machines, multi-language support, and a modern interface.
• Ideal For: Teams needing collaborative coding environments and VM-based development.
• Link: Koding

8. JupyterLab

• Description: JupyterLab is the next-generation interface for Project Jupyter and is particularly popular among data scientists and Python developers. It allows for notebooks, code, and data to be integrated in one place.
• Key Features: Interactive notebooks, support for various languages, plugin architecture, and real-time collaboration (via JupyterHub).
• Ideal For: Data scientists and Python developers who need an interactive coding environment.
• Link: JupyterLab

9. OpenVZ Web IDE

• Description: OpenVZ Web IDE is a lightweight, open-source IDE primarily focused on simplicity and ease of use.
• Key Features: Syntax highlighting, basic file management, and Git integration.
• Ideal For: Small projects needing a lightweight solution.
• Link: OpenVZ Web IDE

10. PaizaCloud

• Description: PaizaCloud is a simple and effective cloud-based IDE that allows you to create development environments with a few clicks.
• Key Features: Easy setup, multi-language support, cloud-based file storage, and remote access.
• Ideal For: Quick setups and web development projects.
• Link: PaizaCloud

11. Fossil SCM (Integrated with its own Web UI)

• Description: Fossil is a distributed version control system that includes an integrated web interface with a lightweight IDE-like experience for managing code.
• Key Features: Built-in wiki, ticketing system, and code management interface.
• Ideal For: Lightweight version control and basic development environment management.
• Link: Fossil SCM

12. WebIDE (by Lucent Sky)

• Description: WebIDE is a minimalistic IDE that supports SSH and file management. It’s ideal for simple editing tasks and remote coding sessions.
• Key Features: SSH access, basic code editing, and file management.
• Ideal For: Remote access for small projects or individual developers needing a lightweight setup.
• Link: WebIDE

13. Sourcegraph

• Description: While not an IDE in the traditional sense, Sourcegraph provides a powerful code navigation and search tool that integrates with your repositories, offering a highly collaborative and efficient way to explore code.
• Key Features: Multi-repo code search, integration with version control systems, and custom search queries.
• Ideal For: Large codebases, collaborative development, and code navigation.
• Link: Sourcegraph

14. StackBlitz Self-Hosted

• Description: StackBlitz is primarily a cloud-based IDE for web development, and it supports self-hosted instances, allowing you to run projects in the browser with local file access.
• Key Features: Instant development environments, integrated npm support, and offline functionality.
• Ideal For: Frontend and web development.
• Link: StackBlitz