# Features

- [Variables and Secrets](/workflow-automation/features/variables-and-secrets.md)
- [Variable Replacement](/workflow-automation/features/variables-and-secrets/variable-replacement.md)
- [Stacksync File System](/workflow-automation/features/stacksync-file-system.md): Stacksync File System provides standard way to receive, securely store, and reuse files across workflow modules.
- [Stacksync Email Trigger](/workflow-automation/features/stacksync-email-trigger.md)