The Code (MIT License):
You can use the source code for free for any personal or commercial project. You can modify it, fork it, and distribute it.

The Brand (Trademark):
The name “PgArachne” and the Logo are trademarks of Zbyněk Vanžura. If you fork the project or offer a commercial “Managed PgArachne” service, you must remove the original branding and logo unless you have obtained a special license.