Downloading NL Compatibility Checker 1.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is a product of Lyle Andrews. The application lies within Internet & Network Tools, more precisely Network tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
NL Compatibility Checker lets you check if your network router is compatible with Network Logger Pro and Network Logger IT. If your router is compatible, you can use Network Logger to graph all the network traffic going through it. Your router must support SNMP (v1 or v2) or UPnP and have one of those protocols enabled. Enabling SNMP or UPnP on your router is typically done by logging into your router's web interface and clicking a checkbox.
You may want to check out more software for Mac, such as PeakHour Compatibility Check, ii.nl or iCal Reply Checker, which might be similar to NL Compatibility Checker.