PowerFactory is described as 'leading power system analysis software application for use in analysing generation, transmission, distribution and industrial systems'. There are six alternatives to PowerFactory for Windows, Online / Web-based and iPhone. The best alternative is DOC, which is free. Other great apps like PowerFactory are Vision Network Analysis (Paid), PSS/E (Paid), NAP - Network Analysis and Planning (Paid) and ETAP (Paid).
DOC is a software dedicated to the design and calculation of single-line diagrams of electrical systems in low and medium voltage, allowing the user to choose switching devices and security, and for verification and coordination of protective devices.
Vision Network Analysis is a program for the planning, design and management of electricity networks. The package can very easily carry out load flow and short-circuit calculations as well as fault and reliability analyzes.
NAP is a software for analysis and planning of electrical networks including Load Flow (ILF), Load Flow with constraints (CPF), Optimized Load Flow (OPF), Short circuit calculation (SCC), Incident simulation (OUTSIM), Stability calculation (STABIL).