LectroTest is an automatic, specification-based testing tool for Perl. Just declare properties that specify the expected behavior of your software, and LectroTest will check your software to see whether those properties hold. It does this by running thousands of trials in which your software is tested against the claims of your properties. LectroTest's testing engine is compatible with other Perl testing packages, fully configurable, and exposed as an object.
WWW::PkgFind watches Web sites, FTP sites, GIT repositories, etc. for new code releases, and downloads them. In other words, it's like a Web spider tuned for downloading software packages and patches. It is also able to generate a queue of incoming packages, to allow subsequent processing (such as running tests on them).
check_mysql runs as a daemon with a continuous connection to MySQL, watching the list of running SELECT queries. It enforces a timeout for queries: if a query runs too long, it is killed and a report including the query and EXPLAIN output are emailed. Its probably not something you'd want to use on a production system, but it is very useful during development and testing phases for finding, analyzing, and optimizing SQL queries.