What are some alternatives?
Basecamp - A simple and elegant project management system.
SpreadsheetConverter.com - Use online spreadsheets, smart forms and beautiful charts in your blog or website. Put your booking and order forms online. Show live charts. Change any cell and the online spreadsheet or live chart immediately updates itself.
MOOVIA - The easiest way to collaborate on projects and ideas.
SpreadsheetWEB - SpreadsheetWEB is a no-code platform that helps businesses translate their collective Microsoft Excel expertise into robust web applications with limited or no reliance on IT resources.
Freedcamp - Our mission is to empower people to achieve great things together. The notion of simple collaboration has been lost and split into hundreds of fragments with countless tools trying to solve each piece.
Keikai - Fastest web spreadsheet for Big Data