IntelliJ Plugins
Open-source plugins included in the distribution of IntelliJ IDEA
...These plugins range from language support (e.g., for Rust, Go, or SQL) to productivity tools, UI themes, database helpers, VCS integrations, code analysis tools, and domain-specific utilities that tailor the IDE to different development workflows. By hosting plugin source code publicly, JetBrains promotes transparency, community contribution, and shared ownership of tooling that improves developer productivity and integrates niche technologies into world-class IDEs. Developers can explore design patterns, sample implementations, and extension points used by real plugins, learn how to build their own, or contribute enhancements and bug fixes.