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Sudip Mondal 13Sudip Mondal 13 

"Lightning App Builder" not visible in the Salesforce Dev org. The org that I am using is new but the "Lightning App Builder" is not available. Any leads in this regard is highly appreciated.

It is probably not enabled on your org. You should contact Salesforce support, and ask them to activate it. Hope this helps!
KristofferGreeneKristofferGreene can set you up an org with it already enabled.