办公套件
YOZO Office
WPS Office – Free Office Download for PC & Mobile, Alternative to MS Office
LibreOffice – Free Office Suite – Based on OpenOffice
# 07/28/2021 以前，总觉得 Libreoffice 运行速度慢。换新电脑才发现，原来是自己配置不行。
AbiWord – a word processing program
Office Open XML
Wikipedia/Office Open XML
Understanding the Open XML file formats
TODO 文档操作
https://en.wikipedia.org/wiki/Office_Open_XML