Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
BareTail - BareTail is a real-time log file monitoring tool. Features Real-time file viewing
logstash - logstash is a tool for managing events and logs.
glogg - glogg is a multi-platform GUI application to browse and search through long or complex log files.
Wazuh - Open Source Host and Endpoint Security
SPHW - LogViewer - A free platform-independent tool for monitoring log files in real-time.