The Equity Reference Calculator
Behind the Calculator‘s web interface is an “engine” written in the C programming language. The full code is available under a permissive Apache license and is documented in detail.
The Equity Reference Calculator engine is hosted on SourceForge, a site for open-source software projects.
Source code can be browsed in a Subversion repository.
Source code documentation can be browsed online (generated by Doxygen).
A formal description of the Calculator‘s algorithms can be found at Calculations for the Calculator. (PDF, 0.5 MB).