Polaris Office Web Sheet - Simple open Sheet files on browser without sign-up
SSuite Axcel Professional Spreadsheet - This powerful and professional spreadsheet has all the tools you need to calculate, analyse, summarize, and present your data in numerical reports or colourful graphics.
Magic Spreadsheet - Human workforce and AI plugged into your Google Spreadsheets
EtherCalc - EtherCalc is a web spreadsheet.
Spreadsheet.com - Spreadsheets that come alive as applications
Keikai - Effortlessly Build Spreadsheet-driven Web Apps