I found this post on the Nvil forum where the developer of NVIL states Rocket3F is based on NVIL

[quote]
IStonia
March 24, 2017, 03:37:12 am

Rocket 3F is a special version of Nvil. It is customized in a way that the customizer thinks it is the best organizing base on his modeling knowledge and experience. Basically Rocket is not customizable. So it is only suitable for people who find it easy to adapt to its fixed workflow.

[/quote]

Ironically, it was I who asked the question about NVIL vs Rocket3F.

Thread here : https://digitalfossils.com/nvil-forum//index.php?topic=2990.30