CirclePing 1.0 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. We recommend checking the downloaded files with any free antivirus. The application is included in Internet & Network Tools. This free Mac app was originally created by Martin Algesten.
From the developer:
CirclePing is a free application that allows you to monitor your IP address. Visualizes current packet loss in a non-intrusive way. Continuously pings a configurable IP address to monitor network conditions. This app lives in your menu bar and is very easy to use.
You may want to check out more Mac applications, such as FileMaker Server, which might be similar to CirclePing.