Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Encyclopædia Britannica - Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.