Luxena (www.luxena.com) has changed direction so they have decided to release the source code to their drivers as open source. Anyone out there using their products can now access the source code at
dbExpress drivers for Informix – http://code.google.com/p/dbexpinf/
dbExpress Extension – http://code.google.com/p/dbxext/
Informix Data Access Components – http://code.google.com/p/idac/
Luxena Common Library (needed by IDAC and dbExpress Extension) – https://code.google.com/p/lxlibrary/