ModbusPal is a project to develop a PC-based Modbus simulator. Its goal is to reproduce a realistic environment, with many slaves and animated register values. Almost everything in ModbusPal can be customized and controlled by scripts.
Tolk is based on the Spring design pattern to Filter & Translate data from data sources eg.TCP/IP connections, text files, databases and Serial (rs232,usb,BT). Typical applications is to manipulate data and manage devices such as IPICO RFID readers
jamod is an object oriented implementation of the Modbus protocol, realized 100% in Java. It allows to quickly realize master and slave applications in various transport flavors (IP and serial).