PalPark - Curate and share your learnings by topics
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Golden - Mapping all human knowledge
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
LearnAwesome - Humanity's universal learning map
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.