ZK Spreadsheet is an open source embeddable web-based online spreadsheet that delivers the rich functionality of Excel within browsers using pure Java. (Moved to http://code.google.com/p/zkspreadsheet/ since ZK Spreadsheet 2.0)
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.