Download of InsomniaX 2.1.8 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. This free software for Mac OS X was originally designed by Andrew James.
We recommend checking the downloaded files with any free antivirus. InsomniaX was developed to work on Mac OS X 10.7 or later. The application lies within System Tools, more precisely General. The most popular versions among the program users are 2.1 and 1.3.
From the developer:
It always has been a missing feature: disabling the sleep mode on a Apple Laptop. Who does not want to use it as a big juke-box or go warwalking. This small utility acts as a wrapper to the Insomnia kernel extension.
You may want to check out more software for Mac, such as Cinch, Overflow or BOINCManager, which might be related to InsomniaX.