I'm not sure you'll find something with such a specific requirement. The first thing that came to mind is server management tools like free alternatives to cpa

I'm not sure you'll find something with such a specific requirement. The first thing that came to mind is server management tools like free alternatives to cpanel/webhostmanager https://froxlor.org/ https://froxlor.org/ You'll have better luck searching online if you look for "free / open source" + specific problem/solution rather than "b2b saas app" in this example i searched for "free alternative to cpanel"