Download of Dizzy 1.11.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software is included in Education Tools. This free Mac application is an intellectual property of Institute for Systems Biology. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Dizzy is a chemical kinetics stochastic simulation software package written in Java. It provides a model definition environment and an implementation of the Gillespie, Gibson-Bruck, and Tau-Leap stochastic algorithms. Dizzy is capable of importing and exporting the SBML model definition language, as well as displaying models graphically using the Cytoscape software system.
You may want to check out more software for Mac, such as The Hidden Object Show: Season 2, Mafia II or Frederic - Resurrection of Music, which might be related to Dizzy.
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