Alex Martelli did initial work on porting from Windows to Linux and Mac OS X.

Christoph Berg did more recent porting and a dds/ddd package for Linux in Debian which includes a Python extension.

The Perl code in ACBLmerge by Matthew Kidd was used as basis for the C++ code in Par.cpp for calculating Par scores and contracts.

Soren Hein made a number of contributions before becoming a co-author starting in v2.8 in 2014.

Pierre Cossard contributed the code for multi-threading on the Mac using GDS.

Many people have contributed, credits for their contributions are given in the source code.