You may download and use STAN under the community license option, without installing a license key. However, structure analysis will be limited to 500 classes. For larger codebases, you'll need a valid license key. For a 30 days evaluation key, get your node id and create an account. 

Please choose the product variant to download/install:

1. Eclipse Extension (STAN IDE)
   
2. Standalone Application (STAN APP)