There are 1 repository under s7-protocol topic.
Mokka7 is native port of Snap7 core in pure Java (fork of moka7 http://snap7.sourceforge.net) and parts of Sharp7.
S7 PLC communication library for Java, based on Moka7
PascalSCADA for Lazarus
Parser of the industrial protocol S7 (S7comm) using Libpcap
Communication gateway between serial devices and a PLC