macOS Console - An application to view live log files.
glogg - glogg is a multi-platform GUI application to browse and search through long or complex log files.
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.
klogg - klogg is the fork of glogg - the fast, smart log explorer.
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
LogViewPlus - Looking for a better log viewer? LogViewPlus is a professional log file viewer that can parse, read, tail, merge and analyze log files in any format. Remote log files (SFTP) and large files are supported. Easy configuration.