WPS Office - Would you need Office Word, Excel or PowerPoint for Home, business or School? WPS.com would give you right version for you.
Plumsail Documents - Document automation software that integrates with your favorite apps to generate documents seamlessly.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
docassemble - docassemble is a free, open-source expert system for guided interviews and document assembly.
LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
DocSpring - DocSpring provides a PDF filling API that makes it easy for programmers to fill out and generate PDF documents.