The best free alternative to Nagios Log Server is Grafana, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Nagios Log Server and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Nagios Log Server are Prometheus (Free, Open Source), Graylog (Free, Open Source), Open Web Analytics (Free, Open Source) and Logstash (Freemium, Open Source).
Visual Syslog Server (daemon) for Windows with a graphical user interface. Visual Syslog Server is a free open source program to receive syslog messages. Useful when setting up routers and systems based on Unix/Linux.
Event Viewer is an advanced tool that displays detailed information about significant events on your computer. It can be helpful when troubleshooting problems and errors with Windows and other programs.
Timber is a beautiful, fast, modern cloud-based logging system designed specifically for developers and applications. Including built in features like tailing a user, tracing HTTP requests, live tailing, automatic context & structuring, and more!.
Seq is a self-hosted server application used to collect and search application log events. Its deeply-integrated query language and JSON-focused data model intended to scale smoothly from simple log searches to complex diagnostic and analytic tasks.
Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation system inspired by Prometheus. It is designed to be very cost effective and easy to operate. It does not index the contents of the logs, but rather a set of labels for each log stream.