A lightning-fast spell checking .NET object, packaged with two complete ASP.NET applications (one in C#, one in VB.NET), SpellServer.NET has built-in customizable dictionaries for US English, UK English, French and Spanish.Server-side checking means that your users don't have to download or install any software, and spell checking is available to all users, regardless of which browser they use.

Ссылка: http://www.chad..download/SpellServer.NET.exe