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dockcheck is a shellscript that can check all your containers for image updates, and then offers you the option to either update and restart them all, or a selection, or none. Very useful if you are in the commandline a lot.
Something like Portainer?
Watchtower is quite popular. It is a watchdog that monitors the images your containers are using, and at regular intervals, checks their registries (Docker Hub, GitHub, etc) if there are new "versions" available. Then it can either automatically pull the image and restart the container to immediately use it. Or it can just notify you about it and you manage the updating yourself.
diun is very similar to that, but it doesnt auto-update, just notifies but does that very well imo.
DCW (dockcheck-web) is based on the above dockcheck but has a web-ui.
I use Dock Check web to get a web page of containers that can be updated. It has notifications via telegram, email etc... Then use portainer to update the ones I want.