SFCC Studio has features such as script debugging, code synchronization, syntax highlighting, auto complete and more...

• Script Debugger
• Project wizard to set up a project with ease.
• Cartridge root configuration settings.
• Sandbox filesystem sync
• Sandbox filesystem clean
• Remote sync console log with links to synced files
• Script injection into isscript elements and ${} braces
• Basic auto completion for ISML tags, attributes, and known valid attribute values.
• Live template shortcuts for ISML tags.
• New DS and ISML file actions
• And more...

• Using IDE built-in plugin system:

  Preferences > Plugins > Marketplace > Search for "sfcc-studio-template" > Install Plugin

• Manually:

  Download the latest release and install it manually using Preferences > Plugins > ⚙️ > Install plugin from disk...

File > Settings > Tools > Commerce Cloud Cartridges

File > Settings > Tools > Commerce Cloud Server

This project is now Gradle based and is much easier to get the development environment setup to work on the plugin. You should only need to import the project in either Intellij Community or Intellij Ultimate and execute the runIde Gradle task. For more information please see the official Jetbrains plugin development documentation.

http://www.jetbrains.org/intellij/sdk/docs/tutorials/build_system.html

https://plugins.jetbrains.com/plugin/11590-salesforce-commerce-cloud-studio