go-modbusmodbus write in pure go, support rtu,ascii,tcp master library,also support tcp slave.(WIP new implement<old: https://github.com/thinkgos/gomodbus >)
arduino-modbus-rtu-tcp-gatewayArduino-based Modbus RTU to Modbus TCP/UDP gateway with web interface. Allows you to connect Modbus RTU slaves (such as sensors, energy meters, HVAC devices) to Modbus TCP/UDP masters (such as home automation systems). You can adjust settings through web interface.
crc16A native node addon to calcalate and verify CRC16 values, adopted by MODBUS agreement
ModbusMechanicCross platform GUI MODBUS TCP/RTU simulator & gateway. Interprets data types including ascii float and int.
huawei solarHome Assistant integration for Huawei Solar inverters via Modbus
modbus-esp8266Most 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.