Downloading He3 1.0.12 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 CD M Santiago. The program lies within System Tools, more precisely System Optimization.
From the developer:
He3 is a multi-window browser. The application allows you to watch media, browse the web and do much more while you stay productive. Your content will never fall behind your other windows even as you switch tasks. All settings are automatic and internal and private. Also available is a history list, cookie jar stash, and both can be cleared or disabled as desired.
You may want to check out more software for Mac, such as TransparentDock, Peek-a-Boo or DiskFire, which might be related to He3.