Downloading Eggnogg+ 1.0 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.
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 Mac application is net.madgarden. The software lies within Games, more precisely Arcade.
From the developer:
Eggnogg is a competitive local-multiplayer arcade game of immortals sword-fighting to the death. The game includes procedurally generated bytebeat tunes that you can edit live, and also create additional songs. It supports configurable keyboard and joystick for both players.
You may want to check out more software for Mac, such as DotBot, Phantasia or Toppler, which might be similar to Eggnogg+.