Downloading switchGPU 1.2 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 software is categorized as System Tools. 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. This free Mac app was originally produced by Joachim Roeleveld.
From the developer:
switchGPU makes your Mac automatically use the integrated GPU when you login. The script will start gfxCardStatus three times consecutively to address the problem of the selection (which GPU) not being preserved immediately. switchGPU uses a version of gfxCardStatus that accepts the mode you want to start the program in as a command line parameter.
You may want to check out more Mac applications, such as Bulldog, Mood Mouse or Localghost, which might be similar to switchGPU.