| Tool | Key Features | Platform | License | | :--- | :--- | :--- | :--- | | | Professional, user-friendly GUI; supports RTU/ASCII; full demo mode; dedicated support. | Windows | Commercial (Paid) | | QModMaster | Open-source GUI; supports Modbus RTU and TCP; designed for testing and debugging. | Cross-platform | Open-source | | ScanBus-BR | Portable (no install); acts as Master/Client/Sniffer; completely free and lightweight. | Windows, Linux | Freeware | | ModbusTools | Cross-platform GUI simulators (client/server); supports TCP, UDP, RTU, ASCII; written in C++/Qt. | Cross-platform | Open-source | | ModbusView TCP | Monitors and simulates ASCII, RTU, and TCP; can act as both a Master and a Slave. | Windows | Freeware |
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