It sounds like Varnish Cache is kind of a distribution of Vinyl Cache. It's based on the FOSS project with its own downstream patches.

On another topic:

> The Varnish Cache FOSS software was initiated and sponsored by the Norvegian newspaper Verdens Gang. They hired a company called “Linpro” to handle the logistics and me to write the code.

> From Linpro grew the company Varnish Software

> IP-Lawyers still insist that Varnish Software owns the Varnish Cache name

Consultants came in a just assumed the IP? It sounds like a pretty complicated cross-border ordeal, but that is still quite a leap.

> What is Varnish Cache?

> Varnish Cache is a distribution of the open-source Vinyl Cache project, made for the modern cloud: ready for Kubernetes, with built-in TLS support, and a long-term-support release cadence with extra modules and tooling layered on top.

(https://www.varnish.org/index.html)