Open ModScan is a Free Modbus Master (Client) Utility

Most complete Modbus library for Arduino. A library that allows your Arduino board to communicate via Modbus protocol, acting as a master, slave or both. Supports network transport (Modbus TCP) and Serial line/RS-485 (Modbus RTU). Supports Modbus TCP Security for ESP8266/ESP32.

ModbusTools are cross-platform (Windows, Linux) GUI simulators (client/server) that support TCP, UDP, RTU, ASCII, RTU/ASCII over TCP/UDP Modbus protocol types.

PHP client for Modbus TCP and Modbus RTU over TCP (can be used for serial)

EasyModbusTCP library for Java implementation

Modbus client for ESP32

A library to implement the master/client portion of the Modbus RTU protocol on Arduino

A modbus client & server simulation tool

Modbus TCP client library to interact with Modbus servers such as PLCs.

Modbus RTU packet sniffer

Modbus master and slave implementation in C++

Modbus client (TCP/RTU) over TCP/Serial for Go

A Modbus client in Go

ModbusBridge is a simple cross-platform (Windows, Linux) Modbus converter/gateway application that provides mutual convertions between different types of Modbus protocol: TCP, RTU, ASC

Modbus client library for .NET

Java implementation of MODBUS TCP client for master devices.

Modbus Client

A thread safe Modbus Client using idiomatic Go concurrency design patterns.

A Modbus client visualizing data from remotes on a single web page

Modbus TCP Client/Server