BRQ is a super easy to use standalone batch renderer for Blender
It's cross platform and works on Windows, MacOS and Linux
Originally built for indie or small teams, it is a completely separate app from Blender editor.
It will queue multiple projects and render them out in the background.
Simply drag and drop blend files, sort them out, choose camera and view layers, start rendering and go
back working in Blender!
https://docs.blender-render-queue.com