Dia

A gtk+ based diagram creation program released under the GPL license. It can be used to draw different kinds of diagrams.
http://www.lysator.liu.se/~alla/dia/

GNOME Office

Meta-project to coordinate productivity applications for GNOME Desktop: AbiWord, Gnumeric, GIMP, Dia, EOG, GNOME-PIM, GNOME-DB. StarOffice may be next.
http://www.gnome.org/gnome-office/

rCalc

A fast and light symbolic calculator for the GNOME desktop environment. It aims to occupy the middle ground between simple point-and-click calculators and full featured mathematical packages.
http://rcalc.sourceforge.net/

gEdit

Lightweight but powerful text editor of the GNOME project.
http://gedit.sourceforge.net/

Gnumeric

A spreadsheet. It is part of the GNOME desktop environment.
http://www.gnome.org/projects/gnumeric/

Evolution

Ximian's mailer, calendar, and contact manager for Gnome.
http://www.ximian.com/products/evolution/

GnuCash

A Gnome Desktop application aimed at personal finances and home users.
http://www.gnucash.org/

GWP - The GNOME Word Processor

The latest incarnation of the Hungry Programmers` word processor known as XWord.
http://www.hungry.com/old-hungry/products/gwp/