beep does what you'd expect: it beeps. But unlike printf("\a"), beep allows you to control pitch, duration, and repetitions. Its job is to live inside shell/perl scripts and allow more granularity than one has otherwise. It is controlled completely through command line options. It's not supposed to be complex, and it isn't - but it makes system monitoring (or whatever else it gets hacked onto) that much more informative.
breloc does binary edits on files to relocate compiled-in prefixes, padding with extra slashes to make up for differences in the length of the prefixes. In order for breloc to be most effective, a binary package should be configured with a prefix that has a lot of extra slashes at the end of it. beloc is distributed as part of the nsbd package, but it is also quite useful independently.
dlkern downloads the current stable/beta/prepatch Linux kernel and its signature, and verifies the signature via GnuPG.pm. Versions are specified on the command line as -s (stable), -b (beta), or -p (pre-patch) (all 3 may be specified at once). Downloads are done via ncftpget, wget, or Net::FTP. It allows specification of 2-letter country code for the kernel mirror system, and selection of compression format (.gz/.bz2).