Ultra Fractal is a fractal generator for download that runs on Windows or Mac OS X. The free trial version runs for 30 days and includes tutorials, and the website provides comprehensive resources and a user forum. The latest version to date is Ultra Fractal 6.01.
The paid program costs between USD 29 and USD 99, depending on the features included.
In addition to the beginner's tutorial available on this wiki, tutorials are available at https://www.notion.so/45879b998b234fe6bf29517b2c19007f and https://www.notion.so/c0ace843bccf4ff88e1ec6d8e620dbd3. Download a comprehensive user guide from https://www.ultrafractal.com/manual.html.