Kiwi Syslog Server is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is Datadog. It's not free, so if you're looking for a free alternative, you could try Graylog or syslog-ng OSE. If that doesn't suit you, our users have ranked more than 10 alternatives to Kiwi Syslog Server and four of them are available for Mac so hopefully you can find a suitable replacement.
Datadog is a monitoring service for IT, Dev & Ops teams who write and run applications at scale, and want to turn the massive amounts of data produced by their apps, tools and services into a unified view of IT infrastructure. 120+ Integrations!.
Graylog is an open source syslog implementation that stores your logs in Elasticsearch. It consists of a server and web interface written in Java that accepts your syslog messages via TCP or UDP (or GELF messages) and stores it in the database.
Mac-OSX Syslog Center is syslog server monitor and analyzer software for syslog events and notifications that supports any vendor and helps to monitor, analyze, report and correlate real-time network events.