The universal add-in for Microsoft Excel. Invoke operations that you define using the Absyntax framework.

Access ACML functions from 64-bit Excel. This project contains various wrappers from 64-bit Excel to the ACML library.

DataFromFile is a small class (written in C#) which makes it easy to deal with data files such as Excel (xls or xlsx) or CSV.

Dodoni.net is a free/open-source library with the aim to provide a framework for quantitative finance and for numerical computing.

TFS Project Estimator is a tool that allows extracts to be taken from TFS into an Excel spreadsheet to measure time taken to complete Tasks, and any child Tasks