Free engineering tools

A Modbus TCP/RTU device that runs on your machine, for developing and testing without hardware.

• Runs as a single executable — no installer, no service to register.
• Configure registers, data types, byte order and simulated values.

Windows x64 · SHA-256 cbac2933b00db656… · What it does → · Documentation →

Connect to a device, find the registers that answer and export a tag map.

• Read-only: function codes 01–04 and read-only device identification.
• Exports io-tags.json, CSV and Excel.

Windows x64 · SHA-256 38e2552749e45942… · What it does → · Documentation →

Poll tags continuously, decode values and diagnose communication problems.

• Several servers at once, trends and logging to CSV, Excel or SQLite.
• Shows raw registers beside the decoded engineering value.

Windows x64 · SHA-256 5997e8923549d070… · What it does → · Documentation →

Find the OPC UA servers on your network, browse one and read its variables.

• Discovers by network sweep and mDNS; scans an address space and reads values, read-only.
• Exports CSV, Excel and JSON. Built on the open-source node-opcua.

Windows x64 · SHA-256 869f6c5a5963c061… · What it does → · Documentation →

Linux x64 (.deb) · SHA-256 8fa341d23d84b1f1…