RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX documents, sort of a Reference Manager or BibTeX for markup languages. It is portable and known to run on Linux, Free/NetBSD, OSX, Solaris, and Windows/Cygwin.
MoneyTrack is a personal financial recording system, means it keeps track of your incomes / expenses via a database which can be accessed in different ways. There are several frontends available (web frontend, java-client, ...).