Download of RemSupp 1.15.3 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. The software relates to System Tools. This free software for Mac OS X was originally developed by RemSupp. We recommend checking the downloaded files with any free antivirus.
From the developer:
RemSupp is a remote desktop app that allows you to access and control another computer over the Internet using your web browser. You can use it on almost any operating system. It is a great tool for advanced technical support, collaboration, and productivity.
You may want to check out more software for Mac, such as jfControlServer, Prey by Fork Ltd. or My Connector, which might be related to RemSupp.