KOffice is an integrated office suite based on the KDE libraries. KOffice currently includes KWord, KSpread, KPresenter, KChart, Karbon14, Krita, Kexi, KFormula, Kugar, and Kivio. There are no special mail and news clients included in KOffice, because there are KMail and KNode available for KDE anyway. All KOffice components work together, and you can embed every KOffice component into any other KOffice component. This is realized using the KParts object model.
OpenOffice.org Quickstarter is a small application that runs in the KDE SystemTray. It is used to quickly start the different OpenOffice.org modules without having to go through the K-Menu. Instead of just starting of applications, you can also select multiple files in the usual opendialog provided by KDE to open them in OpenOffice.org, use a history of recently opened files, configure the app to do one of the above described functions on a simple double click, and use the app to keep a hidden instance of OpenOffice.org in memory to achieve much shorter startup times of the OpenOffice.org modules.
Calligra is an integrated suite of applications that cover office, creative, and management needs. It offers applications on both desktop computers and mobile platforms like tablets and smartphones. OpenDocument Format (ODF) is used, making it compatible with OpenOffice.org, LibreOffice, and Microsoft Office. Calligra Suite contains the following applications: Calligra Words (word processor), Sheets (spreadsheets), Stage (presentations), Flow (diagrams and flowcharts), Kexi (visual database creator), Braindump (note taking), Plan (project management), Krita (drawing), and Karbon (vector graphics).