KmusicdB is a music information manager for KDE3 and a PostgreSQL database. You can add your music collection and browse through it in a customizable viewer. KmusicdB includes CDDB support, reports and searching. This is not an MP3 manager.
BOND is a RAD (rapid application development) tool for creating database applications. It allows you to develop GUI front ends to PostgreSQL databases. It uses XML to define widget layout and how to obtain information from databases.
Automatic-controlled GUI-Frontend for playing with a digital model railroad using the SRCP protocol. (see http://srcpd.sourceforge.net) kdigirail uses kde, qt, linux, srcpd and postgres. You can drive your railway also by hand.