Aegis 2.01 for Mac 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. Aegis for Mac lies within Security Tools, more precisely Personal Security. This Mac application was originally designed by Jiulong Zhao. 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:
Aegis is a simple application that works as a faithful guardian against spies and malware. It allows you to protect your Mac from threats from external disks, whether they are Thunder, Firewire, USB disks or flash drives, or even SD cards. With Aegis, only your trusted external disks will be able to access your Mac computer. The program can even block or unblock individual partitions of a storage device.
You may want to check out more software for Mac, such as VPN Aegis, which might be related to Aegis.