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Energy Plus is probably the best tool for general research. EcoTect is good for basic work but not more detailed investigation. IES is a good - if expensive - package for consulting work, and is particularly useful for representing HVAC controls as its native settings are closer to industry practice than Energy Plus in my experience.
EnergyPlus is the most authoritative and has been extensively used and validated by research community
Carrier HAP, Energy Plus mostly used
I agree with SAJIN SHAMSU KUNJU but I like Design Builders and engine of Design Builders is Energy Plus