Hey @batkjo, Alex here - creator of OpenFaaS. We have a really well thought-out CLI that works in a very similar way to the serverless CLI and is written in Go which makes it super fast, it also uses YAML. @alexdebrie1 is right that we also have a provider for the Serverless Inc CLI in progress.
Checkout our official CLI here - https://github.com/openfaas/faas-cli and the beginner tutorial here - https://blog.alexellis.io/quickstart-openfaas-cli/