jNetStream is a sniffer and a protocol analyzer. A set of applications and complete Java library are provided with a comprehensive API. Hundreds of protocols have been defined, and the list can be expanded with a simple NPL language. It is appropriate for custom protocol development, grad students, and network teachers/professors.
TDA (Thread Dump Analyzer) is a small Swing GUI for analyzing thread dumps generated by the Sun Java VM. It has been tested with 1.4.2_x, 1.5.0_x, and 1.6.0_x releases. It provides statistics, gives information about locked monitors and waiting threads, can diff between threads to look for similarities, and has "long running thread" detection.
jWatchdog delivers a simple watchdog to actively monitor your infrastructure and send you notifications in case something goes wrong. It is configured using a simple XML configuration file. This configuration file can be changed on-the-fly without a need to restart the watchdog. jWatchdog does not offer data collection itself. It assumes that you already collected the data on which you want to run jWatchdog. The de facto standard tool Collectd is recommended for data collection. jWatchdog assumes that you use the RRDTool collectd output plugin to store the collected data in RRD files, or use Graphite as a datasource.