Google Drive - Sheets web based spreadsheet from Google.
Spread32
Freemium
Spread32 is a lightweight spreadsheet application.
You Need A Budget
Commercial
You Need a Budget combines easy software with Four Simple Rules to help you quickly gain control of your money.
Compare iWork - Numbers with alternatives
Compare Google Drive - Sheets and iWork - Numbers and decide which is most suitable for you.
Compare You Need A Budget and iWork - Numbers and decide which is most suitable for you.
Compare Spread32 and iWork - Numbers and decide which is most suitable for you.