Business Functions is a free function library for Microsoft Excel designed to make business plans, budgets, structured financings and cashflows.

It's based on the principle that using a purpose-built function in a cell is more transparent, reliable, flexible and accurate than an overly long Excel formula.

This principle has been extended to a comprehensive projections functions that project cashflows and accruals with a high degree of daycount accuracy.

Up to 500 or so functions in C++ do the dirty work of projecting costs and revenues, coping with time periods, growth etc.