cdb is a fast, reliable, lightweight package for creating and reading constant databases. It features fast lookups, low overhead, no random limits, fast atomic database replacement, and fast database dumps. cdb is designed to be used in mission-critical applications like email. Database replacement is safe against system crashes. Readers don't have to pause during a rewrite.
cdctl is a program similar to eject. Like eject, it can eject your CD-ROM/DVD drive, but it does a whole lot more. Cdctl provides a user interface to the 2.2 kernel's uniform cdrom driver's ioctl calls, and most 2.0 cdrom drivers (ide-cd and scsi). Cdctl is also capable of doing everything a regular console cd player can as well as drive capability interrogation, autoeject setting, maximum/mininum speed cap setting, disc-changer disc selection, disc status readback, MCN querying, table of contents header readback, track header readback, and much more.
Butterfly is a timing system designed for environments in which time spent on the Internet is charged for. Using ipchains(8) firewalling software, the Butterfly daemon cooperates with a web-based administration interface and a client interface to control time spent browsing. The ISP Edition allows the creation of several 'sites' and provides detailed accounting information for all the sites included.