IntelliJ IDEA OSS

The open‑source edition provides the core of JetBrains’ IntelliJ Platform, which underlies IDEs such as IntelliJ IDEA and PyCharm. It contains the code for the editor, project model, language support infrastructure, and UI components, and can be built and run locally to create a functional development environment. Developers can clone the repository, fetch required Android modules, and compile the platform using IntelliJ IDEA 2023.2 or newer, following the provided contribution and build instructions.

The project is aimed at contributors, plugin authors, and teams that need a customizable IDE foundation without proprietary extensions. It serves as the reference implementation for building IntelliJ‑based tools and for extending the platform with additional languages, frameworks, or integrations.

Distinctive aspects include its status as the official open‑source codebase for JetBrains IDEs, the ability to generate prebuilt binaries or compile locally, and the requirement to keep the main and Android modules on matching branches. The repository is actively maintained, with CI badges showing build health for both IntelliJ IDEA and PyCharm components.