We went with a mix of curl, Invoke-WebRequest, favourite scripting language, HTTP files, IDE tooling, Insomina, after Postman went cloud online and became a forbidden tool on our systems.
Also I am not counting that Insomina won't follow the same footsteps as Postman.
I wrote my own api invoker, https://placeholders.cc/api-invoker/, mainly because postman is slow, eats a ton of memory and it becomes more and more restrictive to non logged in users. In don't mind having an electron based application like open. but i hate to have 10 like it open in the same time.
Also I am not counting that Insomina won't follow the same footsteps as Postman.