Alt+Mac 1.0 could be downloaded 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 System Tools, more precisely Automation. You can install this free app on Mac OS X 10.7 or later.
The most popular version among the application users is 1.0. This free Mac app is an intellectual property of Phil Russell. Alt_mac.app_.zip is the most common filename for this program's installer. We recommend checking the downloaded files with any free antivirus.
From the developer:
Alt Mac application helps you operate the menu bar on the Mac as easily as you can on Windows. When you press the Alt (a.k.a. Option) key by itself, it places focus on the menu bar. Then you can use the arrow keys, letter keys, and return key to select menu commands as you’ve always been able to do.
You may want to check out more Mac applications, such as Alter Aeon, nvALT or App List for Trello, which might be related to Alt+Mac.