glogg - glogg is a multi-platform GUI application to browse and search through long or complex log files.

NetVizura NetFlow Analyzer - NetFlow Analyzer is a solution for bandwidth monitoring and traffic analysis. It helps with traffic investigation, analysis and reporting

klogg - klogg is the fork of glogg - the fast, smart log explorer.

Nfsen - NfSen is a graphical web based front end for the nfdump netflow tools that allows you to:

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.

Zabbix - Track, record, alert and visualize performance and availability of IT resources