Download of AltTab 11.4.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X was originally produced by lwouis.
AltTab for Mac lies within System Tools, more precisely System Optimization. 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.
From the developer:
AltTab brings the power of Windows’s “alt-tab” window switcher to macOS.
You may want to check out more Mac applications, such as unpkg, Super Empty Trash or MagicanPaster, which might be related to AltTab.