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. Currently, the game supports 20 different track styles, and 39 different trains, which cover most of the real-world styles. You can create Racing/Dueling rides, complete with dispatch syncronization. Play Ride Op, and have total control over the ride, including transfer tracks. Share your creations online on one of the many fan-created exchange sites. Create hills and valleys, and lakes and rivers using the integrated Terrain editor. Powerful supports system that allows complete control over the placement and size of your supports. Of course, the game will generate defaults for you if you so wish. Over 55 different demo tracks are included for your enjoyment.
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.