JChav is a way to see the change in performance of your Web application over time by running a benchmark test for each build you produce. It is an Ant task that, when used in conjunction with the JMeter ant task, produces historic views of the performance of your application. Charts are produced for individaul pages of the application along with summary data. If integrated with cruise-control or similar build tools, you will get an idea if the changes you are making to your Web application are improving or degrading performance.
google-rfc-2445 is a Java implementation of RFC 2445 recurrence rules. RFC 2445 describes a scheme for calendar interoperability. This project implements core parts of RFC 2445, including a parser for recurrence rules and date lists and a mechanism for evaluating recurrence rules.
Logfilter is a tool for performing ad hoc analysis on Apache log files. Logfilter is especially useful when you wish to find records matching very specific criteria, since you can specify exactly which fields to match. The tool also plays well in a Unix environment by accepting input either through files or via stdin.
Testar is a tool that reduces testing time for large Java unit test suites. It runs on top of JUnit and automatically selects individual tests to execute based on changes made to the code since the previous tool invocation. It can be used both from the command line and inside an IDE.