...You can measure differences (often to sub-millisecond accuracy) between clocks on different machines. You can log application events in a .csv format for subsequent analysis. You can also generate CPU loading logs in a .csv format.
JSnapshot is an advanced java exception logging, monitoring and analysis tool. It traces thrown exceptions in real-time and logs a snapshot of call stack, variables and objects for every thrown exception. Fully integrated with Eclipse IDE.
Stat4j is a simple lightweight extension to the popular Java logging package log4. It allows logs to be intercepted and mined in real-time for application statistics including performance metrics.