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For small projects or learning, AVEVA offers — a lightweight, low-cost SCADA. While not free, it starts at a few hundred dollars for up to 25 I/O points. Some OEMs bundle a free demo version with hardware.

AVEVA offers its entire Monitoring and Control Portfolio eLearning for free. This is an excellent resource for beginners to learn the fundamentals of SCADA and HMI development directly from the source. Wonderware Intouch Scada Software Free UPD