log4j support for native nagios (nsca) integration
creates an extra socket for syslog (e.g. in a chroot jail)
Partylog2 is a Graylog2 appliance based in Turnkey Linux 12
A detailed user action logging engine
Open Source System and Network Monitoring for Linux Desktop
Passive Proxy Daemon sniffs packets and creates squid proxy logs
Graphical java logfile viewer/follower.
Log and track user/computer info in MS Windows environments
Cross-platform multi-tail log colorizer.
A grep-like utility for log files.