Office software has long been seen as lacking in the free software world. Users have long asked for replacements for Microsoft tools such as Word and Excel, but these are so complex that replacements were hard to develop. The situation changed when the OpenOffice.org project started (following Sun's release of the StarOffice code under a free license). Nowadays Debian contains Libre Office, a fork of OpenOffice.org. The GNOME and KDE projects are still working on their offerings (GNOME Office and Calligra Suite), and the friendly competition leads to interesting results. For instance, the Gnumeric spreadsheet (part of GNOME Office) is even better than OpenOffice.org/Libre Office in some domains, notably the precision of its calculations. On the word processing front, the OpenOffice.org and Libre Office suites still lead the way.

Another important feature for users is the ability to import Word and Excel documents received from contacts or found in archives. Even though all office suites have filters which allow working on these formats, only the ones found in OpenOffice.org and Libre Office are functional enough for daily use.

Libre Office, Calligra Suite and GNOME Office are, respectively, available in the libreoffice, calligra and gnome-office Debian packages. Language-specific packs for Libre Office are distributed in separate packages: libreoffice-l10n-* and libreoffice-help-* most notably; some features such as spelling dictionaries, hyphenation patterns and thesauri are in separate packages, such as myspell-*, hyphen-* and mythes-*. Note that Calligra Suite used to be called KOffice, and the koffice package is a transitional package.