SystemTrader 1.5.5 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Business Tools, more precisely Finances. We recommend checking the downloaded files with any free antivirus. The actual developer of this software for Mac is Edge SARL.
From the developer:
SystemTrader is a powerful stock market software for the Mac. Features: Charting and technical analysis Market screener, to find profit opportunities among thousand of stocks Watchlists, to focus on a subset of the market Portfolio tracker Trading system backtesting
You may want to check out more Mac applications, such as iRatchet, Cashflow or Lotto Sorcerer, which might be similar to SystemTrader.