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Being a totally web-based spreadsheet service, EditGrid is designed for collaboration and real world use.
The spreadsheet interface supports the maximum number of cells, and is optimized for speed in modern browsers. With full function support, you can upload your existing spreadsheets and start working online with ease. There’s also very good access control system for you to decide whom to share your spreadsheet with, and a comprehensive collections of permalink for accessing and exporting.
EditGrid actually binds itself with the semantic web vision, and will focus on integration with others tools and interoperability in the near future.