MadKey 2.0 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.
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. The actual developer of this free software for Mac is Pavel Kostka et al. MadKey for Mac belongs to Games.
From the developer:
MadKey is an automatic key presser and mouse clicker. It is a vital tool for every gamer. The application allows to simulate key presses and mouse clicks with a configurable frequency. Therefore, you can set the key you want to press virtually, configure the start/stop shortcut, and determine the time interval for repeating the action.
You may want to check out more software for Mac, such as Panda3D, Game Maker or CrossOver Games, which might be similar to MadKey.