Gibbon 1.8.1 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 actual developer of this free Mac application is Broken Rules Interactive Media GmbH. The application is categorized as Games.
From the developer:
Gibbon: Beyond the Trees is an ecological adventure about a family of gibbons who find themselves lost in a dangerous world beyond their understanding. You experience free-flowing dynamic movement based on brachiation, the way real gibbons swing through the trees. You need to master acrobatic moves, including launching from another gibbon’s hands in mid air.
You may want to check out more software for Mac, such as Broken Sword - The Smoking Mirror: Remastered, Beneath a Steel Sky or Broken Sword: Director's Cut, which might be similar to Gibbon.