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Power-system calculations and studies are considering an essential issue to study the behavior of the distributed power system networks. In this paper development GUI software is used for stability studies of distribution power networks with distributed energy resources. The software is based on multi- tier architecture. The multi-tier architecture consists of different layers which perform different functions in the program and provide advantages of reusability and extendibility. The proposed developed GUI software deploys Microsoft.Net framework, Microsoft visual C++ and the SQL server as data base management system to manage the application database. The developed GUI software is designed and applied for the analysis of three-phase radial load flow, voltage stability, continuation power flow and transient stability. Specific case studies are considered and demonstrated in this work.