macOS Console - An application to view live log files.
BareTail - BareTail is a real-time log file monitoring tool. Features Real-time file viewing
Event Log Explorer - Windows event log viewer software. Windows event log analysis, view and monitor security, system, and other logs on Windows servers and workstations
Goldilogs - Intuitive and powerful real-time log viewer. Low CPU/RAM/network usage. Handles large files (gigabytes), instant loading, colour highlighting, tailing and powerful text/RegEx searching.
glogg - glogg is a multi-platform GUI application to browse and search through long or complex log files.
SPHW - LogViewer - A free platform-independent tool for monitoring log files in real-time.