Ekloga offers Stevin, a comprehensive package for econometric model solving.
Stevin comes in two versions. The first one is a DLL, fully integrated with Excel ®, so that the user has the full functionality of Excel. The other version is in .exe form, but lacks some features that Excel version has.
The syntax is simple, but at the same time it offers many possibilities. Each equation is written in the familiar form y = f (y, x). All common functions are available. Moreover, the user can specify his own functions.
Obviously, if-then-else constructions allowed, also in nested form. Endogenous variables may be fixed on a certain value by endogenizing an exogenous variable.
Data files are usually Excel files, but text files may also be used. Results can be displayed in table format as specified by the user.
For further details, see Download. If you want to try, you can download the program. It has the full functionality, but the number of equations is limited to 10.