Port Tester X 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. The software lies within Internet & Network Tools, more precisely Network tools. This free Mac application is a product of Colourfull Creations. 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:
Port Tester is a small application that was written to test out sockets/ports on the Mac. You can use it to connect to an IP and start a conversation or to listen on a specific port for data.
You may want to check out more software for Mac, such as Simple Port Tester, Quick Port Test or DVR Port Forwarder, which might be related to Port Tester X.
Network Tools
Debugging Tools