This is an open source (BSD) implementation of the ODVA (www.odva.org) CIP Ethernet/IP industrial automation protocol stack. This originally was a git svn clone from http://sourceforge.net/projects/opener/ which dissapeared from Sourceforge after I cloned it. I will maintain this as a fork.  Another active maintainer is here https://github.com/CapXilinx/OpENer/, which i will track alongside any other implementations i can find find.