Downloading SimThyr 3.3.3 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
The common filenames for the application's installer are simthyr_3_3_1_win.zip, simthyr_3_2_mac_universal.zip, simthyr_3.2.3.dmg, simthyr_3_2_4.dmg or simthyr_3_0_mac.zip etc. You can launch this free app on Mac OS X 10.4.0 or later. The bundle identifier for this app is net.sf.simthyr.
The application is included in Education Tools. The following versions: 3.3, 3.2 and 3.0 are the most frequently downloaded ones by the program users. We recommend checking the downloaded files with any free antivirus. The actual developer of this free software for Mac is J. W. Dietrich.
From the developer:
SimThyr is a simulation program for the pituitary thyroid feedback control that is based on a parametrically isomorphic model of the overall system. Applications of this program cover research, including development of hypotheses, and education of students in biology and medicine, nurses and patients.
You may want to check out more software for Mac, such as Gee, Arcade Math Blocks or Solar Eclipse Maestro, which might be related to SimThyr.