You can download Scream Machines 1.57 from our software library for free. The software is included in Home & Hobby Tools. The actual developer of the software is Brian Grooms.
From the developer:
Scream Machines is a rollercoaster simulator that allows you to build your own track layouts, and then go for a virtual ride.
You may want to check out more software, such as Screaming Frog SEO Spider, Screaming Frog Log File Analyser or Submit Machine, which might be related to Scream Machines.