Polaris Office Web Sheet - Simple open Sheet files on browser without sign-up
EtherCalc - EtherCalc is a web spreadsheet.
Magic Spreadsheet - Human workforce and AI plugged into your Google Spreadsheets
Aspose.Cells for Cloud - Aspose.Cells for Cloud is a REST based API for processing spreadsheets in the cloud.
Spreadsheet.com - Spreadsheets that come alive as applications
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.