OpenSCAD and Gitlab. I can quickly iterate on designs through code, push it to my Gitlab instance, and have my CI/CD pipelines pick it up, render it, and automatically slice it in some common profiles to send to Octoprint
Very different. I haven't used FreeCAD much but it is far more visual and full-featured (I believe it even has some simulation features for moving parts) where OpenSCAD is really just primitive shapes and scripting but for my workflows (mostly creating 3D printed parts) it works well