ChessX is a chess database that allows you to browse, manage, and analyze chess games.
KnowIt is a simple KDE tool for managing notes in a manner similar to TuxCards. Notes are organized in tree-like hierarchy and can store data in a rich text format, so that bold, italics, and lists are supported, as well as any character set.
A Web GIS application framework.
A Perl application development and refactoring environment.