I do not much about Andrei.

However I did know Rocket3F was based upon NVIL.

I have an earlier post where I asked the creator of NVIL on the NVIL forms what the relationship was between NVIL and Rocket3F where he replied Rocket3F is a version of NVIL aimed at artists.
I guess it is sort of like Blender and BlenderForArtist.

I agree about 3D software coming and going. I used to use and love Hexagon but it too is like Studebaker Motor Car Company. Gone. As well as Groboto3D, e-onsoftware's Vue (I still use Vue and Groboto3D).

Wings3D is still around and maintained and a very capable modeler. An app I love very much but lacked some of the features Hexagon and Silo had.

Amapi is no more, Silo3D stopped development for a few years but is back. Truespace3D is gone and had one of the most terrible user interfaces of all.

Bryce3D has stopped development for a very long time.