notMac 1 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. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The application lies within System Tools, more precisely General.
From the developer:
The notMac application allows users to replicate .Mac services locally on their own machine or server. The server is OS neutral, while the client is OS X specific. notMac is a free, open-source utility for using the client-side dotMac services provided by Apple. Since many people already operate their own servers and don't require dotMac's server-side features - such as an @mac.