DeforaOS Mixer is a graphical volume mixer written in Gtk+. While initially written for NetBSD's own audio API, it also supports OSS (which is used on systems such as *BSD and Linux).
DeforaOS cpp is a C pre-processor and library, as used by the DeforaOS asm and c99 projects when parsing source code.
A syntax highlighting text editor written in Java Swing.
An event and task manager.