Download of Visifire 5.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program is categorized as Developer Tools. The actual developer of this Mac application is Webyog Softworks.
From the developer:
Visifire is a set of open source charts - powered by Microsoft Silverlight. With Visifire you can create and embed visually stunning animated Silverlight Charts within minutes. Visifire is easy to use and independent of the server side technology.
You may want to check out more software for Mac, such as BetaBuilder for iOS Apps, which might be related to Visifire.