PulseAudio, previously known as Polypaudio, is a sound server for POSIX and WIN32 systems. It is a drop in replacement for the ESD sound server with much better latency, mixing/re-sampling quality and overall architecture.

Zabbix is a server/client network monitoring system with many features. It can be used for:

GNU Denemo is a GUI musical score editor written in C/GTK+. It is intended primarily as a front end to GNU Lilypond, but is adaptable to other computer-music-related purposes as well.

Displays Debian control information, devscript details and details of the files that would be installed (names, sizes and locations). Files within the package can be viewed within the package or externally.

The Common UNIX Printing System (or CUPS(tm)) is a printing system and general replacement for lpd and the like. It supports the Internet Printing Protocol (IPP), and has its own filtering driver model for handling various document types.