Ettercap is a multipurpose sniffer/interceptor/logger for switched LAN.
It supports active and passive dissection of many protocols (even ciphered ones) and includes many feature for network and host analysis. Development has been moved to GitHub, https://github.com/Ettercap/ettercap
SpreadAppender is a log4j appender module that broadcasts log messages over a local multicast network using the Spread API. It is very efficient and perfect for clusters of network applications. Your sysadmin will thank you for it.