Spread for ASP.NET is a complete ASP.NET spreadsheet component that supports bound or unbound modes (no dataset needed), AJAX, native Microsoft Excel import/export, in-cell editing, multiple edits on multiple rows without server round trips, client-side column/row resizing, multiple sheets, searching, filtering, multiple cell types, validations, cell spans, multiple headers, sorting, complete customization at the cell level, over 300 built-in calculation functions, hierarchical display and much more.

Licensing: Product licensing is one licensed copy per developer. There are no run-time or royalty fees.
If you have five developers working on the project, you need five licenses and can deploy to any number of servers.

Website: www.fpoint.com