SoftMaker FreeOffice is an office suite that has good compatibility with Microsoft Office application file formats and provides most of its functions and features.
This is one of the best free alternative offices that is not inferior in functionality.

It includes:

• TextMaker - text editor (Word)
• PlanMaker - calculations, spreadsheets and charts (Excel)
• Presentations - presentation creation (Power Point)

Transform productivity and security with Xodo PDF Studio, built for professionals. Work with over 60 advanced tools, including OCR, digital signatures, batch processing and encryption, designed to streamline your workflow.

Free Xodo PDF Reader viewer - makes working with PDF files easier and more efficient, allows you to open, navigate, select, and manage documents without restrictions.