Koffice is an integrated office suite designed for KDE. It currently includes a
spreadsheet (Kspread), Presentation application (Kpresent), Chart and diagram
application (Kchart), Image viewer (Kimage), Formula Generator (Kformula)
and A word Processor (Kword).
All Koffice applications are still in alpha stage, but that does not mean it's unstable, just that all the features are not implemented yet. Some are more usable then other but development happens very fast and with time applications will become usable.