| | License | Key Features | |--------------|-------------|------------------| | OpenPLC | GPLv3 | IEC 61131-3, basic protection logic | | LibreCAD | GPL | Single-line diagrams (manual, no automation) | | CODESYS | Free for development | Advanced logic but not protection-specific | | Eaton’s Power Xpert | Free viewer | Read APS-like files | | IEC 61850 Client Simulator (free trial) | Freemium | GOOSE/SMV testing |

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