Office productivity suites for PCs & laptops
Includes spreadsheets & word processing

www.libreoffice.org
www.officesuite.com

Office productivity for Android phones & tablets
(Open Play Store)

Google Docs (word processing)
Google Sheets (spreadsheet)
Office Suite

Free with a Google account

Google Drive (15 GB storage)
Google Calendar

www.minibiz7.com recommends
that you install and use antivirus software on all devices.