Open Settings > Plugins > Marketplace in your IDE, search for Move Language and install the plugin. To open an existing project, use File | Open and point to the directory containing Move.toml.

New features are announced in changelog.

• Syntax highlighting
• Code formatting
• Go-to-definition
• Rename refactoring
• Type inference
• Move.toml and move binary integration

For git dependencies specified in Move.toml file you need to manually run move package build to populate build/ directory.

All Intellij-based IDEs starting from version 2021.1. For 2020.3 and below you can use old versions of the plugin.