The Spreadsheet Guru
Microsoft Excel 2016 Tutorials - Free, Online and Easy
Excel Templates, Spreadsheets, Calendars and Calculators by Spreadsheet123
SpreadsheetGear - Microsoft Excel Compatible Spreadsheet Component for Microsoft .NET, ASP.NET, Windows Forms, WPF, Silverlight, C#, VB.NET, XLS, XLSX, XLSM and Microsoft Visual Studio
SpreadsheetServer
Trading Journal Spreadsheet | Trade tracking, for: Stock, Options, Futures, Forex traders
My Spreadsheet Lab | The site is about Microsoft Excel.
The Spreadsheet Page - By John Walkenbach
Value Spreadsheet | Value Investing Blog by Nick Kraakman
Spreadsheet1 - Excel Data Analytics - Home
SpreadsheetLight for .NET Framework