We didn't have enough time for testing, but there's also Clutch, coming from the Lyft team. (Checking right now I'm not able to see a "releases" page with versions and that stuff...)
First time seeing this, but reading the docs it looks more like a modern take on Rundeck[0]. A way to give developers one-click access to operational tasks. Rather than a service catalog and developer portal like Backstage.
https://clutch.sh/