There was a download of FStr 1.4.0 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program is categorized as Development Tools. The actual developer of the free program is COPPE UFRJ. We recommend checking the downloaded files with any free antivirus.
From the developer:
What is FStr?
You may want to check out more software, such as FindBugs, Dicom Validation Tool or Lucid Spec, which might be similar to FStr.