Visioo-writer supports document formats such as KWord, and this, an open-source word processor written in C++?
Visioo-Writer Visioo-writer - The OpenDocument file viewer is a computer program designed to run on multiple operating systems with the explicit ability to view OpenDocument and OpenOffice.org/StarOffice documents. It is currently in a stable state (version 0.6) but updates continue. The goal is to create a small application to open popular and free document formats (e.g., AbiWord, KWord). The software is open source, and written in Python. Downloads are available for Microsoft Windows and Linux.
LyX LyX (styled as formula_1; pronounced ] ) is an open source document processor based on top of the LaTeX typesetting system. Unlike most word processors, which follow the WYSIWYG ("what you see is what you get") paradigm, LyX has a WYSIWYM ("what you see is what you mean") approach, where what shows up on the screen is only an approximation of what will show up on the page.