PopHub 2.1.4 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 software for Mac is Katsuma Tanaka.
From the developer:
PopHub is a simple GitHub client for the menu bar. The program installs a small icon placed on your Mac's upper bar, so that you can access it with ease each time you want to check for computer users' activities. Therefore, the application will show you the activities of other users and the notifications you've received.