# 1. Prerequisites Steps required before starting implementation of a sample custom language support. ## Download and Install IntelliJ IDEA Download and install either IntelliJ IDEA Ultimate or IntelliJ IDEA Community Edition from [here](https://www.jetbrains.com/idea/download/). ## Check out Community Edition Source Files > While not required, having the full sources of the platform and all bundled plugins available for browsing allows finding related implementations. > {style="note"} Download the IntelliJ IDEA Community Edition source files as described in the IntelliJ IDEA Community Edition [README](%gh-ic%/README.md) file. ## Install Required Plugins Make sure that the _Plugin DevKit_ and _Gradle_ plugins are enabled. Install and enable [Grammar-Kit](https://plugins.jetbrains.com/plugin/6606-grammar-kit) and [PsiViewer](https://plugins.jetbrains.com/plugin/227-psiviewer) (optionally) plugins. ## Create a Project Create an empty [IntelliJ Platform Plugin project](creating_plugin_project.md) or start using [](plugin_github_template.md) when creating a plugin hosted on GitHub.