SimulCAT 1.2.30.211 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular version among the program users is 1.2. The actual developer of the free software is Kyung (Chris) T. Han.
The software lies within Education Tools, more precisely Teaching Tools. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software.
From the developer:
SimulCAT is a program for simulating computerized adaptive test administration. It was developed to serve various purposes ranging from fundamental CAT research to technical CAT program evaluations. This application offers many features, including a wide range of item selection algorithms, adaptability for a variety of CAT administration environments, etc.
You may want to check out more software, such as Musical Scales, Touch-Typing or GATEPrep, which might be similar to SimulCAT.