This is the only truly free, open-source version under the GPL license.
These are commercial software . You can download them for free and use the 30-day trial (Evaluation Mode), but continued use requires a license. The evaluation version typically adds watermarks to exported diagrams. Key Features of StarUML staruml 32 bit free download
The original open-source version is natively 32-bit and remains available on SourceForge . This version is completely free and unmaintained but remains popular for basic UML modeling on older Windows systems (Windows XP/Vista/7). This is the only truly free, open-source version