Dynaframe or the Pro version on Patreon. I've been using the Pro version for about 8 months and really like it. I have it setup with an RPi4 and a 15.6" portable monitor. I pointed it to my NAS pictures folder. It doesn't rely on any services beyond a local network. I'd recommend using Ethernet instead of wifi for stability. Only issue I've run into is the web UI to configure folders and settings can fail to load for some reason. I think this is a bug though, and I should grab the latest version to see if it's fixed.
Dynaframe or the Pro version on Patreon. I've been using the Pro version for about 8 months and really like it. I have it setup with an RPi4 and a 15.6" portable monitor. I pointed it to my NAS pictures folder. It doesn't rely on any services beyond a local network. I'd recommend using Ethernet instead of wifi for stability. Only issue I've run into is the web UI to configure folders and settings can fail to load for some reason. I think this is a bug though, and I should grab the latest version to see if it's fixed.