As we need to have a complete Erlang calculator for our ComTrafic TEM software http://comtrafic.com/ we found a good candidate in SourceForge : https://sourceforge.net/projects/erlangcalc/.
But as we are mainly Delphi users we decided to fork it.
We tried to keep the names and (partially) the architecture of erlangcalc if the owners of it needs to implement our modifications and functions.
Today the project is in Pre Alpha release (0.1) : we try to have the same functions as erlangcalc.